1178 lines
44 KiB
Plaintext
1178 lines
44 KiB
Plaintext
ThinkPad ACPI Extras Driver
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Version 0.15
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July 1st, 2007
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Borislav Deianov <borislav@users.sf.net>
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Henrique de Moraes Holschuh <hmh@hmh.eng.br>
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http://ibm-acpi.sf.net/
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This is a Linux driver for the IBM and Lenovo ThinkPad laptops. It
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supports various features of these laptops which are accessible
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through the ACPI and ACPI EC framework, but not otherwise fully
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supported by the generic Linux ACPI drivers.
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This driver used to be named ibm-acpi until kernel 2.6.21 and release
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0.13-20070314. It used to be in the drivers/acpi tree, but it was
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moved to the drivers/misc tree and renamed to thinkpad-acpi for kernel
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2.6.22, and release 0.14.
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Status
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------
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The features currently supported are the following (see below for
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detailed description):
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- Fn key combinations
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- Bluetooth enable and disable
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- video output switching, expansion control
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- ThinkLight on and off
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- limited docking and undocking
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- UltraBay eject
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- CMOS control
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- LED control
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- ACPI sounds
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- temperature sensors
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- Experimental: embedded controller register dump
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- LCD brightness control
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- Volume control
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- Fan control and monitoring: fan speed, fan enable/disable
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- Experimental: WAN enable and disable
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A compatibility table by model and feature is maintained on the web
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site, http://ibm-acpi.sf.net/. I appreciate any success or failure
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reports, especially if they add to or correct the compatibility table.
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Please include the following information in your report:
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- ThinkPad model name
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- a copy of your DSDT, from /proc/acpi/dsdt
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- a copy of the output of dmidecode, with serial numbers
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and UUIDs masked off
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- which driver features work and which don't
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- the observed behavior of non-working features
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Any other comments or patches are also more than welcome.
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Installation
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------------
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If you are compiling this driver as included in the Linux kernel
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sources, simply enable the CONFIG_THINKPAD_ACPI option, and optionally
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enable the CONFIG_THINKPAD_ACPI_BAY option if you want the
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thinkpad-specific bay functionality.
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Features
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--------
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The driver exports two different interfaces to userspace, which can be
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used to access the features it provides. One is a legacy procfs-based
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interface, which will be removed at some time in the distant future.
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The other is a new sysfs-based interface which is not complete yet.
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The procfs interface creates the /proc/acpi/ibm directory. There is a
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file under that directory for each feature it supports. The procfs
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interface is mostly frozen, and will change very little if at all: it
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will not be extended to add any new functionality in the driver, instead
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all new functionality will be implemented on the sysfs interface.
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The sysfs interface tries to blend in the generic Linux sysfs subsystems
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and classes as much as possible. Since some of these subsystems are not
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yet ready or stabilized, it is expected that this interface will change,
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and any and all userspace programs must deal with it.
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Notes about the sysfs interface:
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Unlike what was done with the procfs interface, correctness when talking
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to the sysfs interfaces will be enforced, as will correctness in the
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thinkpad-acpi's implementation of sysfs interfaces.
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Also, any bugs in the thinkpad-acpi sysfs driver code or in the
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thinkpad-acpi's implementation of the sysfs interfaces will be fixed for
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maximum correctness, even if that means changing an interface in
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non-compatible ways. As these interfaces mature both in the kernel and
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in thinkpad-acpi, such changes should become quite rare.
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Applications interfacing to the thinkpad-acpi sysfs interfaces must
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follow all sysfs guidelines and correctly process all errors (the sysfs
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interface makes extensive use of errors). File descriptors and open /
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close operations to the sysfs inodes must also be properly implemented.
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The version of thinkpad-acpi's sysfs interface is exported by the driver
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as a driver attribute (see below).
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Sysfs driver attributes are on the driver's sysfs attribute space,
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for 2.6.20 this is /sys/bus/platform/drivers/thinkpad_acpi/.
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Sysfs device attributes are on the driver's sysfs attribute space,
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for 2.6.20 this is /sys/devices/platform/thinkpad_acpi/.
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Driver version
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--------------
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procfs: /proc/acpi/ibm/driver
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sysfs driver attribute: version
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The driver name and version. No commands can be written to this file.
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Sysfs interface version
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-----------------------
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sysfs driver attribute: interface_version
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Version of the thinkpad-acpi sysfs interface, as an unsigned long
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(output in hex format: 0xAAAABBCC), where:
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AAAA - major revision
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BB - minor revision
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CC - bugfix revision
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The sysfs interface version changelog for the driver can be found at the
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end of this document. Changes to the sysfs interface done by the kernel
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subsystems are not documented here, nor are they tracked by this
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attribute.
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Changes to the thinkpad-acpi sysfs interface are only considered
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non-experimental when they are submitted to Linux mainline, at which
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point the changes in this interface are documented and interface_version
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may be updated. If you are using any thinkpad-acpi features not yet
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sent to mainline for merging, you do so on your own risk: these features
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may disappear, or be implemented in a different and incompatible way by
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the time they are merged in Linux mainline.
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Changes that are backwards-compatible by nature (e.g. the addition of
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attributes that do not change the way the other attributes work) do not
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always warrant an update of interface_version. Therefore, one must
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expect that an attribute might not be there, and deal with it properly
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(an attribute not being there *is* a valid way to make it clear that a
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feature is not available in sysfs).
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Hot keys
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--------
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procfs: /proc/acpi/ibm/hotkey
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sysfs device attribute: hotkey_*
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In a ThinkPad, the ACPI HKEY handler is responsible for comunicating
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some important events and also keyboard hot key presses to the operating
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system. Enabling the hotkey functionality of thinkpad-acpi signals the
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firmware that such a driver is present, and modifies how the ThinkPad
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firmware will behave in many situations.
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When the hotkey feature is enabled and the hot key mask is set (see
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below), the various hot keys either generate ACPI events in the
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following format:
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ibm/hotkey HKEY 00000080 0000xxxx
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or events over the input layer. The input layer support accepts the
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standard IOCTLs to remap the keycodes assigned to each hotkey.
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When the input device is open, the driver will suppress any ACPI hot key
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events that get translated into a meaningful input layer event, in order
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to avoid sending duplicate events to userspace. Hot keys that are
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mapped to KEY_RESERVED in the keymap are not translated, and will always
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generate an ACPI ibm/hotkey HKEY event, and no input layer events.
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The hot key bit mask allows some control over which hot keys generate
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events. If a key is "masked" (bit set to 0 in the mask), the firmware
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will handle it. If it is "unmasked", it signals the firmware that
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thinkpad-acpi would prefer to handle it, if the firmware would be so
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kind to allow it (and it often doesn't!).
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Not all bits in the mask can be modified. Not all bits that can be
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modified do anything. Not all hot keys can be individually controlled
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by the mask. Some models do not support the mask at all, and in those
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models, hot keys cannot be controlled individually. The behaviour of
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the mask is, therefore, higly dependent on the ThinkPad model.
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Note that unmasking some keys prevents their default behavior. For
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example, if Fn+F5 is unmasked, that key will no longer enable/disable
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Bluetooth by itself.
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Note also that not all Fn key combinations are supported through ACPI.
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For example, on the X40, the brightness, volume and "Access IBM" buttons
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do not generate ACPI events even with this driver. They *can* be used
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through the "ThinkPad Buttons" utility, see http://www.nongnu.org/tpb/
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procfs notes:
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The following commands can be written to the /proc/acpi/ibm/hotkey file:
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echo enable > /proc/acpi/ibm/hotkey -- enable the hot keys feature
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echo disable > /proc/acpi/ibm/hotkey -- disable the hot keys feature
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echo 0xffffffff > /proc/acpi/ibm/hotkey -- enable all hot keys
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echo 0 > /proc/acpi/ibm/hotkey -- disable all possible hot keys
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... any other 8-hex-digit mask ...
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echo reset > /proc/acpi/ibm/hotkey -- restore the original mask
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sysfs notes:
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hotkey_bios_enabled:
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Returns the status of the hot keys feature when
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thinkpad-acpi was loaded. Upon module unload, the hot
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key feature status will be restored to this value.
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0: hot keys were disabled
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1: hot keys were enabled (unusual)
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hotkey_bios_mask:
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Returns the hot keys mask when thinkpad-acpi was loaded.
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Upon module unload, the hot keys mask will be restored
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to this value.
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hotkey_enable:
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Enables/disables the hot keys feature, and reports
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current status of the hot keys feature.
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0: disables the hot keys feature / feature disabled
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1: enables the hot keys feature / feature enabled
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hotkey_mask:
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bit mask to enable driver-handling and ACPI event
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generation for each hot key (see above). Returns the
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current status of the hot keys mask, and allows one to
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modify it.
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hotkey_all_mask:
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bit mask that should enable event reporting for all
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supported hot keys, when echoed to hotkey_mask above.
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Unless you know which events need to be handled
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passively (because the firmware *will* handle them
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anyway), do *not* use hotkey_all_mask. Use
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hotkey_recommended_mask, instead. You have been warned.
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hotkey_recommended_mask:
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bit mask that should enable event reporting for all
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supported hot keys, except those which are always
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handled by the firmware anyway. Echo it to
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hotkey_mask above, to use.
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hotkey_radio_sw:
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if the ThinkPad has a hardware radio switch, this
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attribute will read 0 if the switch is in the "radios
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disabled" postition, and 1 if the switch is in the
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"radios enabled" position.
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input layer notes:
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A Hot key is mapped to a single input layer EV_KEY event, possibly
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followed by an EV_MSC MSC_SCAN event that shall contain that key's scan
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code. An EV_SYN event will always be generated to mark the end of the
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event block.
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Do not use the EV_MSC MSC_SCAN events to process keys. They are to be
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used as a helper to remap keys, only. They are particularly useful when
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remapping KEY_UNKNOWN keys.
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The events are available in an input device, with the following id:
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Bus: BUS_HOST
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vendor: 0x1014 (PCI_VENDOR_ID_IBM) or
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0x17aa (PCI_VENDOR_ID_LENOVO)
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product: 0x5054 ("TP")
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version: 0x4101
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The version will have its LSB incremented if the keymap changes in a
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backwards-compatible way. The MSB shall always be 0x41 for this input
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device. If the MSB is not 0x41, do not use the device as described in
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this section, as it is either something else (e.g. another input device
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exported by a thinkpad driver, such as HDAPS) or its functionality has
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been changed in a non-backwards compatible way.
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Adding other event types for other functionalities shall be considered a
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backwards-compatible change for this input device.
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Thinkpad-acpi Hot Key event map (version 0x4101):
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ACPI Scan
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event code Key Notes
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0x1001 0x00 FN+F1 -
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0x1002 0x01 FN+F2 IBM: battery (rare)
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Lenovo: Screen lock
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0x1003 0x02 FN+F3 Many IBM models always report
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this hot key, even with hot keys
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disabled or with Fn+F3 masked
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off
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IBM: screen lock
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Lenovo: battery
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0x1004 0x03 FN+F4 Sleep button (ACPI sleep button
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semanthics, i.e. sleep-to-RAM).
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It is always generate some kind
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of event, either the hot key
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event or a ACPI sleep button
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event. The firmware may
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refuse to generate further FN+F4
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key presses until a S3 or S4 ACPI
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sleep cycle is performed or some
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time passes.
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0x1005 0x04 FN+F5 Radio. Enables/disables
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the internal BlueTooth hardware
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and W-WAN card if left in control
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of the firmware. Does not affect
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the WLAN card.
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Should be used to turn on/off all
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radios (bluetooth+W-WAN+WLAN),
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really.
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0x1006 0x05 FN+F6 -
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0x1007 0x06 FN+F7 Video output cycle.
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Do you feel lucky today?
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0x1008 0x07 FN+F8 IBM: toggle screen expand
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Lenovo: configure ultranav
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0x1009 0x08 FN+F9 -
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.. .. ..
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0x100B 0x0A FN+F11 -
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0x100C 0x0B FN+F12 Sleep to disk. You are always
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supposed to handle it yourself,
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either through the ACPI event,
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or through a hotkey event.
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The firmware may refuse to
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generate further FN+F4 key
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press events until a S3 or S4
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ACPI sleep cycle is performed,
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or some time passes.
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0x100D 0x0C FN+BACKSPACE -
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0x100E 0x0D FN+INSERT -
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0x100F 0x0E FN+DELETE -
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0x1010 0x0F FN+HOME Brightness up. This key is
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always handled by the firmware
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in IBM ThinkPads, even when
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unmasked. Just leave it alone.
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For Lenovo ThinkPads with a new
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BIOS, it has to be handled either
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by the ACPI OSI, or by userspace.
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0x1011 0x10 FN+END Brightness down. See brightness
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up for details.
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0x1012 0x11 FN+PGUP Thinklight toggle. This key is
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always handled by the firmware,
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even when unmasked.
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0x1013 0x12 FN+PGDOWN -
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0x1014 0x13 FN+SPACE Zoom key
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0x1015 0x14 VOLUME UP Internal mixer volume up. This
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key is always handled by the
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firmware, even when unmasked.
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NOTE: Lenovo seems to be changing
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this.
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0x1016 0x15 VOLUME DOWN Internal mixer volume up. This
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key is always handled by the
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firmware, even when unmasked.
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NOTE: Lenovo seems to be changing
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this.
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0x1017 0x16 MUTE Mute internal mixer. This
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key is always handled by the
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firmware, even when unmasked.
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0x1018 0x17 THINKPAD Thinkpad/Access IBM/Lenovo key
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0x1019 0x18 unknown
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.. .. ..
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0x1020 0x1F unknown
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The ThinkPad firmware does not allow one to differentiate when most hot
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keys are pressed or released (either that, or we don't know how to, yet).
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For these keys, the driver generates a set of events for a key press and
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immediately issues the same set of events for a key release. It is
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unknown by the driver if the ThinkPad firmware triggered these events on
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hot key press or release, but the firmware will do it for either one, not
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both.
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If a key is mapped to KEY_RESERVED, it generates no input events at all,
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and it may generate a legacy thinkpad-acpi ACPI hotkey event.
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If a key is mapped to KEY_UNKNOWN, it generates an input event that
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includes an scan code, and it may also generate a legacy thinkpad-acpi
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ACPI hotkey event.
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If a key is mapped to anything else, it will only generate legacy
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thinkpad-acpi ACPI hotkey events if nobody has opened the input device.
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Non hot-key ACPI HKEY event map:
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0x5001 Lid closed
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0x5002 Lid opened
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0x7000 Radio Switch may have changed state
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Bluetooth
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---------
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procfs: /proc/acpi/ibm/bluetooth
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sysfs device attribute: bluetooth_enable
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This feature shows the presence and current state of a ThinkPad
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Bluetooth device in the internal ThinkPad CDC slot.
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Procfs notes:
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If Bluetooth is installed, the following commands can be used:
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echo enable > /proc/acpi/ibm/bluetooth
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echo disable > /proc/acpi/ibm/bluetooth
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Sysfs notes:
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If the Bluetooth CDC card is installed, it can be enabled /
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disabled through the "bluetooth_enable" thinkpad-acpi device
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attribute, and its current status can also be queried.
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enable:
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0: disables Bluetooth / Bluetooth is disabled
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1: enables Bluetooth / Bluetooth is enabled.
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Note: this interface will be probably be superseeded by the
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generic rfkill class, so it is NOT to be considered stable yet.
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Video output control -- /proc/acpi/ibm/video
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--------------------------------------------
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This feature allows control over the devices used for video output -
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LCD, CRT or DVI (if available). The following commands are available:
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echo lcd_enable > /proc/acpi/ibm/video
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echo lcd_disable > /proc/acpi/ibm/video
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echo crt_enable > /proc/acpi/ibm/video
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echo crt_disable > /proc/acpi/ibm/video
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echo dvi_enable > /proc/acpi/ibm/video
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echo dvi_disable > /proc/acpi/ibm/video
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echo auto_enable > /proc/acpi/ibm/video
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echo auto_disable > /proc/acpi/ibm/video
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echo expand_toggle > /proc/acpi/ibm/video
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echo video_switch > /proc/acpi/ibm/video
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Each video output device can be enabled or disabled individually.
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Reading /proc/acpi/ibm/video shows the status of each device.
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Automatic video switching can be enabled or disabled. When automatic
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video switching is enabled, certain events (e.g. opening the lid,
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docking or undocking) cause the video output device to change
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automatically. While this can be useful, it also causes flickering
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and, on the X40, video corruption. By disabling automatic switching,
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the flickering or video corruption can be avoided.
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The video_switch command cycles through the available video outputs
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(it simulates the behavior of Fn-F7).
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Video expansion can be toggled through this feature. This controls
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whether the display is expanded to fill the entire LCD screen when a
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mode with less than full resolution is used. Note that the current
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video expansion status cannot be determined through this feature.
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Note that on many models (particularly those using Radeon graphics
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chips) the X driver configures the video card in a way which prevents
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Fn-F7 from working. This also disables the video output switching
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features of this driver, as it uses the same ACPI methods as
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Fn-F7. Video switching on the console should still work.
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UPDATE: There's now a patch for the X.org Radeon driver which
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addresses this issue. Some people are reporting success with the patch
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while others are still having problems. For more information:
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https://bugs.freedesktop.org/show_bug.cgi?id=2000
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ThinkLight control -- /proc/acpi/ibm/light
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------------------------------------------
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The current status of the ThinkLight can be found in this file. A few
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models which do not make the status available will show it as
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"unknown". The available commands are:
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echo on > /proc/acpi/ibm/light
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echo off > /proc/acpi/ibm/light
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Docking / undocking -- /proc/acpi/ibm/dock
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------------------------------------------
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Docking and undocking (e.g. with the X4 UltraBase) requires some
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actions to be taken by the operating system to safely make or break
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|
the electrical connections with the dock.
|
|
|
|
The docking feature of this driver generates the following ACPI events:
|
|
|
|
ibm/dock GDCK 00000003 00000001 -- eject request
|
|
ibm/dock GDCK 00000003 00000002 -- undocked
|
|
ibm/dock GDCK 00000000 00000003 -- docked
|
|
|
|
NOTE: These events will only be generated if the laptop was docked
|
|
when originally booted. This is due to the current lack of support for
|
|
hot plugging of devices in the Linux ACPI framework. If the laptop was
|
|
booted while not in the dock, the following message is shown in the
|
|
logs:
|
|
|
|
Mar 17 01:42:34 aero kernel: thinkpad_acpi: dock device not present
|
|
|
|
In this case, no dock-related events are generated but the dock and
|
|
undock commands described below still work. They can be executed
|
|
manually or triggered by Fn key combinations (see the example acpid
|
|
configuration files included in the driver tarball package available
|
|
on the web site).
|
|
|
|
When the eject request button on the dock is pressed, the first event
|
|
above is generated. The handler for this event should issue the
|
|
following command:
|
|
|
|
echo undock > /proc/acpi/ibm/dock
|
|
|
|
After the LED on the dock goes off, it is safe to eject the laptop.
|
|
Note: if you pressed this key by mistake, go ahead and eject the
|
|
laptop, then dock it back in. Otherwise, the dock may not function as
|
|
expected.
|
|
|
|
When the laptop is docked, the third event above is generated. The
|
|
handler for this event should issue the following command to fully
|
|
enable the dock:
|
|
|
|
echo dock > /proc/acpi/ibm/dock
|
|
|
|
The contents of the /proc/acpi/ibm/dock file shows the current status
|
|
of the dock, as provided by the ACPI framework.
|
|
|
|
The docking support in this driver does not take care of enabling or
|
|
disabling any other devices you may have attached to the dock. For
|
|
example, a CD drive plugged into the UltraBase needs to be disabled or
|
|
enabled separately. See the provided example acpid configuration files
|
|
for how this can be accomplished.
|
|
|
|
There is no support yet for PCI devices that may be attached to a
|
|
docking station, e.g. in the ThinkPad Dock II. The driver currently
|
|
does not recognize, enable or disable such devices. This means that
|
|
the only docking stations currently supported are the X-series
|
|
UltraBase docks and "dumb" port replicators like the Mini Dock (the
|
|
latter don't need any ACPI support, actually).
|
|
|
|
UltraBay eject -- /proc/acpi/ibm/bay
|
|
------------------------------------
|
|
|
|
Inserting or ejecting an UltraBay device requires some actions to be
|
|
taken by the operating system to safely make or break the electrical
|
|
connections with the device.
|
|
|
|
This feature generates the following ACPI events:
|
|
|
|
ibm/bay MSTR 00000003 00000000 -- eject request
|
|
ibm/bay MSTR 00000001 00000000 -- eject lever inserted
|
|
|
|
NOTE: These events will only be generated if the UltraBay was present
|
|
when the laptop was originally booted (on the X series, the UltraBay
|
|
is in the dock, so it may not be present if the laptop was undocked).
|
|
This is due to the current lack of support for hot plugging of devices
|
|
in the Linux ACPI framework. If the laptop was booted without the
|
|
UltraBay, the following message is shown in the logs:
|
|
|
|
Mar 17 01:42:34 aero kernel: thinkpad_acpi: bay device not present
|
|
|
|
In this case, no bay-related events are generated but the eject
|
|
command described below still works. It can be executed manually or
|
|
triggered by a hot key combination.
|
|
|
|
Sliding the eject lever generates the first event shown above. The
|
|
handler for this event should take whatever actions are necessary to
|
|
shut down the device in the UltraBay (e.g. call idectl), then issue
|
|
the following command:
|
|
|
|
echo eject > /proc/acpi/ibm/bay
|
|
|
|
After the LED on the UltraBay goes off, it is safe to pull out the
|
|
device.
|
|
|
|
When the eject lever is inserted, the second event above is
|
|
generated. The handler for this event should take whatever actions are
|
|
necessary to enable the UltraBay device (e.g. call idectl).
|
|
|
|
The contents of the /proc/acpi/ibm/bay file shows the current status
|
|
of the UltraBay, as provided by the ACPI framework.
|
|
|
|
EXPERIMENTAL warm eject support on the 600e/x, A22p and A3x (To use
|
|
this feature, you need to supply the experimental=1 parameter when
|
|
loading the module):
|
|
|
|
These models do not have a button near the UltraBay device to request
|
|
a hot eject but rather require the laptop to be put to sleep
|
|
(suspend-to-ram) before the bay device is ejected or inserted).
|
|
The sequence of steps to eject the device is as follows:
|
|
|
|
echo eject > /proc/acpi/ibm/bay
|
|
put the ThinkPad to sleep
|
|
remove the drive
|
|
resume from sleep
|
|
cat /proc/acpi/ibm/bay should show that the drive was removed
|
|
|
|
On the A3x, both the UltraBay 2000 and UltraBay Plus devices are
|
|
supported. Use "eject2" instead of "eject" for the second bay.
|
|
|
|
Note: the UltraBay eject support on the 600e/x, A22p and A3x is
|
|
EXPERIMENTAL and may not work as expected. USE WITH CAUTION!
|
|
|
|
CMOS control
|
|
------------
|
|
|
|
procfs: /proc/acpi/ibm/cmos
|
|
sysfs device attribute: cmos_command
|
|
|
|
This feature is mostly used internally by the ACPI firmware to keep the legacy
|
|
CMOS NVRAM bits in sync with the current machine state, and to record this
|
|
state so that the ThinkPad will retain such settings across reboots.
|
|
|
|
Some of these commands actually perform actions in some ThinkPad models, but
|
|
this is expected to disappear more and more in newer models. As an example, in
|
|
a T43 and in a X40, commands 12 and 13 still control the ThinkLight state for
|
|
real, but commands 0 to 2 don't control the mixer anymore (they have been
|
|
phased out) and just update the NVRAM.
|
|
|
|
The range of valid cmos command numbers is 0 to 21, but not all have an
|
|
effect and the behavior varies from model to model. Here is the behavior
|
|
on the X40 (tpb is the ThinkPad Buttons utility):
|
|
|
|
0 - Related to "Volume down" key press
|
|
1 - Related to "Volume up" key press
|
|
2 - Related to "Mute on" key press
|
|
3 - Related to "Access IBM" key press
|
|
4 - Related to "LCD brightness up" key pess
|
|
5 - Related to "LCD brightness down" key press
|
|
11 - Related to "toggle screen expansion" key press/function
|
|
12 - Related to "ThinkLight on"
|
|
13 - Related to "ThinkLight off"
|
|
14 - Related to "ThinkLight" key press (toggle thinklight)
|
|
|
|
The cmos command interface is prone to firmware split-brain problems, as
|
|
in newer ThinkPads it is just a compatibility layer. Do not use it, it is
|
|
exported just as a debug tool.
|
|
|
|
LED control -- /proc/acpi/ibm/led
|
|
---------------------------------
|
|
|
|
Some of the LED indicators can be controlled through this feature. The
|
|
available commands are:
|
|
|
|
echo '<led number> on' >/proc/acpi/ibm/led
|
|
echo '<led number> off' >/proc/acpi/ibm/led
|
|
echo '<led number> blink' >/proc/acpi/ibm/led
|
|
|
|
The <led number> range is 0 to 7. The set of LEDs that can be
|
|
controlled varies from model to model. Here is the mapping on the X40:
|
|
|
|
0 - power
|
|
1 - battery (orange)
|
|
2 - battery (green)
|
|
3 - UltraBase
|
|
4 - UltraBay
|
|
7 - standby
|
|
|
|
All of the above can be turned on and off and can be made to blink.
|
|
|
|
ACPI sounds -- /proc/acpi/ibm/beep
|
|
----------------------------------
|
|
|
|
The BEEP method is used internally by the ACPI firmware to provide
|
|
audible alerts in various situations. This feature allows the same
|
|
sounds to be triggered manually.
|
|
|
|
The commands are non-negative integer numbers:
|
|
|
|
echo <number> >/proc/acpi/ibm/beep
|
|
|
|
The valid <number> range is 0 to 17. Not all numbers trigger sounds
|
|
and the sounds vary from model to model. Here is the behavior on the
|
|
X40:
|
|
|
|
0 - stop a sound in progress (but use 17 to stop 16)
|
|
2 - two beeps, pause, third beep ("low battery")
|
|
3 - single beep
|
|
4 - high, followed by low-pitched beep ("unable")
|
|
5 - single beep
|
|
6 - very high, followed by high-pitched beep ("AC/DC")
|
|
7 - high-pitched beep
|
|
9 - three short beeps
|
|
10 - very long beep
|
|
12 - low-pitched beep
|
|
15 - three high-pitched beeps repeating constantly, stop with 0
|
|
16 - one medium-pitched beep repeating constantly, stop with 17
|
|
17 - stop 16
|
|
|
|
Temperature sensors
|
|
-------------------
|
|
|
|
procfs: /proc/acpi/ibm/thermal
|
|
sysfs device attributes: (hwmon) temp*_input
|
|
|
|
Most ThinkPads include six or more separate temperature sensors but only
|
|
expose the CPU temperature through the standard ACPI methods. This
|
|
feature shows readings from up to eight different sensors on older
|
|
ThinkPads, and up to sixteen different sensors on newer ThinkPads.
|
|
|
|
For example, on the X40, a typical output may be:
|
|
temperatures: 42 42 45 41 36 -128 33 -128
|
|
|
|
On the T43/p, a typical output may be:
|
|
temperatures: 48 48 36 52 38 -128 31 -128 48 52 48 -128 -128 -128 -128 -128
|
|
|
|
The mapping of thermal sensors to physical locations varies depending on
|
|
system-board model (and thus, on ThinkPad model).
|
|
|
|
http://thinkwiki.org/wiki/Thermal_Sensors is a public wiki page that
|
|
tries to track down these locations for various models.
|
|
|
|
Most (newer?) models seem to follow this pattern:
|
|
|
|
1: CPU
|
|
2: (depends on model)
|
|
3: (depends on model)
|
|
4: GPU
|
|
5: Main battery: main sensor
|
|
6: Bay battery: main sensor
|
|
7: Main battery: secondary sensor
|
|
8: Bay battery: secondary sensor
|
|
9-15: (depends on model)
|
|
|
|
For the R51 (source: Thomas Gruber):
|
|
2: Mini-PCI
|
|
3: Internal HDD
|
|
|
|
For the T43, T43/p (source: Shmidoax/Thinkwiki.org)
|
|
http://thinkwiki.org/wiki/Thermal_Sensors#ThinkPad_T43.2C_T43p
|
|
2: System board, left side (near PCMCIA slot), reported as HDAPS temp
|
|
3: PCMCIA slot
|
|
9: MCH (northbridge) to DRAM Bus
|
|
10: Clock-generator, mini-pci card and ICH (southbridge), under Mini-PCI
|
|
card, under touchpad
|
|
11: Power regulator, underside of system board, below F2 key
|
|
|
|
The A31 has a very atypical layout for the thermal sensors
|
|
(source: Milos Popovic, http://thinkwiki.org/wiki/Thermal_Sensors#ThinkPad_A31)
|
|
1: CPU
|
|
2: Main Battery: main sensor
|
|
3: Power Converter
|
|
4: Bay Battery: main sensor
|
|
5: MCH (northbridge)
|
|
6: PCMCIA/ambient
|
|
7: Main Battery: secondary sensor
|
|
8: Bay Battery: secondary sensor
|
|
|
|
|
|
Procfs notes:
|
|
Readings from sensors that are not available return -128.
|
|
No commands can be written to this file.
|
|
|
|
Sysfs notes:
|
|
Sensors that are not available return the ENXIO error. This
|
|
status may change at runtime, as there are hotplug thermal
|
|
sensors, like those inside the batteries and docks.
|
|
|
|
thinkpad-acpi thermal sensors are reported through the hwmon
|
|
subsystem, and follow all of the hwmon guidelines at
|
|
Documentation/hwmon.
|
|
|
|
|
|
EXPERIMENTAL: Embedded controller register dump -- /proc/acpi/ibm/ecdump
|
|
------------------------------------------------------------------------
|
|
|
|
This feature is marked EXPERIMENTAL because the implementation
|
|
directly accesses hardware registers and may not work as expected. USE
|
|
WITH CAUTION! To use this feature, you need to supply the
|
|
experimental=1 parameter when loading the module.
|
|
|
|
This feature dumps the values of 256 embedded controller
|
|
registers. Values which have changed since the last time the registers
|
|
were dumped are marked with a star:
|
|
|
|
[root@x40 ibm-acpi]# cat /proc/acpi/ibm/ecdump
|
|
EC +00 +01 +02 +03 +04 +05 +06 +07 +08 +09 +0a +0b +0c +0d +0e +0f
|
|
EC 0x00: a7 47 87 01 fe 96 00 08 01 00 cb 00 00 00 40 00
|
|
EC 0x10: 00 00 ff ff f4 3c 87 09 01 ff 42 01 ff ff 0d 00
|
|
EC 0x20: 00 00 00 00 00 00 00 00 00 00 00 03 43 00 00 80
|
|
EC 0x30: 01 07 1a 00 30 04 00 00 *85 00 00 10 00 50 00 00
|
|
EC 0x40: 00 00 00 00 00 00 14 01 00 04 00 00 00 00 00 00
|
|
EC 0x50: 00 c0 02 0d 00 01 01 02 02 03 03 03 03 *bc *02 *bc
|
|
EC 0x60: *02 *bc *02 00 00 00 00 00 00 00 00 00 00 00 00 00
|
|
EC 0x70: 00 00 00 00 00 12 30 40 *24 *26 *2c *27 *20 80 *1f 80
|
|
EC 0x80: 00 00 00 06 *37 *0e 03 00 00 00 0e 07 00 00 00 00
|
|
EC 0x90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
|
|
EC 0xa0: *ff 09 ff 09 ff ff *64 00 *00 *00 *a2 41 *ff *ff *e0 00
|
|
EC 0xb0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
|
|
EC 0xc0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
|
|
EC 0xd0: 03 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
|
|
EC 0xe0: 00 00 00 00 00 00 00 00 11 20 49 04 24 06 55 03
|
|
EC 0xf0: 31 55 48 54 35 38 57 57 08 2f 45 73 07 65 6c 1a
|
|
|
|
This feature can be used to determine the register holding the fan
|
|
speed on some models. To do that, do the following:
|
|
|
|
- make sure the battery is fully charged
|
|
- make sure the fan is running
|
|
- run 'cat /proc/acpi/ibm/ecdump' several times, once per second or so
|
|
|
|
The first step makes sure various charging-related values don't
|
|
vary. The second ensures that the fan-related values do vary, since
|
|
the fan speed fluctuates a bit. The third will (hopefully) mark the
|
|
fan register with a star:
|
|
|
|
[root@x40 ibm-acpi]# cat /proc/acpi/ibm/ecdump
|
|
EC +00 +01 +02 +03 +04 +05 +06 +07 +08 +09 +0a +0b +0c +0d +0e +0f
|
|
EC 0x00: a7 47 87 01 fe 96 00 08 01 00 cb 00 00 00 40 00
|
|
EC 0x10: 00 00 ff ff f4 3c 87 09 01 ff 42 01 ff ff 0d 00
|
|
EC 0x20: 00 00 00 00 00 00 00 00 00 00 00 03 43 00 00 80
|
|
EC 0x30: 01 07 1a 00 30 04 00 00 85 00 00 10 00 50 00 00
|
|
EC 0x40: 00 00 00 00 00 00 14 01 00 04 00 00 00 00 00 00
|
|
EC 0x50: 00 c0 02 0d 00 01 01 02 02 03 03 03 03 bc 02 bc
|
|
EC 0x60: 02 bc 02 00 00 00 00 00 00 00 00 00 00 00 00 00
|
|
EC 0x70: 00 00 00 00 00 12 30 40 24 27 2c 27 21 80 1f 80
|
|
EC 0x80: 00 00 00 06 *be 0d 03 00 00 00 0e 07 00 00 00 00
|
|
EC 0x90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
|
|
EC 0xa0: ff 09 ff 09 ff ff 64 00 00 00 a2 41 ff ff e0 00
|
|
EC 0xb0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
|
|
EC 0xc0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
|
|
EC 0xd0: 03 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
|
|
EC 0xe0: 00 00 00 00 00 00 00 00 11 20 49 04 24 06 55 03
|
|
EC 0xf0: 31 55 48 54 35 38 57 57 08 2f 45 73 07 65 6c 1a
|
|
|
|
Another set of values that varies often is the temperature
|
|
readings. Since temperatures don't change vary fast, you can take
|
|
several quick dumps to eliminate them.
|
|
|
|
You can use a similar method to figure out the meaning of other
|
|
embedded controller registers - e.g. make sure nothing else changes
|
|
except the charging or discharging battery to determine which
|
|
registers contain the current battery capacity, etc. If you experiment
|
|
with this, do send me your results (including some complete dumps with
|
|
a description of the conditions when they were taken.)
|
|
|
|
LCD brightness control
|
|
----------------------
|
|
|
|
procfs: /proc/acpi/ibm/brightness
|
|
sysfs backlight device "thinkpad_screen"
|
|
|
|
This feature allows software control of the LCD brightness on ThinkPad
|
|
models which don't have a hardware brightness slider.
|
|
|
|
It has some limitations: the LCD backlight cannot be actually turned on or off
|
|
by this interface, and in many ThinkPad models, the "dim while on battery"
|
|
functionality will be enabled by the BIOS when this interface is used, and
|
|
cannot be controlled.
|
|
|
|
The backlight control has eight levels, ranging from 0 to 7. Some of the
|
|
levels may not be distinct.
|
|
|
|
There are two interfaces to the firmware for brightness control, EC and CMOS.
|
|
To select which one should be used, use the brightness_mode module parameter:
|
|
brightness_mode=1 selects EC mode, brightness_mode=2 selects CMOS mode,
|
|
brightness_mode=3 selects both EC and CMOS. The driver tries to autodetect
|
|
which interface to use.
|
|
|
|
Procfs notes:
|
|
|
|
The available commands are:
|
|
|
|
echo up >/proc/acpi/ibm/brightness
|
|
echo down >/proc/acpi/ibm/brightness
|
|
echo 'level <level>' >/proc/acpi/ibm/brightness
|
|
|
|
Sysfs notes:
|
|
|
|
The interface is implemented through the backlight sysfs class, which is poorly
|
|
documented at this time.
|
|
|
|
Locate the thinkpad_screen device under /sys/class/backlight, and inside it
|
|
there will be the following attributes:
|
|
|
|
max_brightness:
|
|
Reads the maximum brightness the hardware can be set to.
|
|
The minimum is always zero.
|
|
|
|
actual_brightness:
|
|
Reads what brightness the screen is set to at this instant.
|
|
|
|
brightness:
|
|
Writes request the driver to change brightness to the given
|
|
value. Reads will tell you what brightness the driver is trying
|
|
to set the display to when "power" is set to zero and the display
|
|
has not been dimmed by a kernel power management event.
|
|
|
|
power:
|
|
power management mode, where 0 is "display on", and 1 to 3 will
|
|
dim the display backlight to brightness level 0 because
|
|
thinkpad-acpi cannot really turn the backlight off. Kernel
|
|
power management events can temporarily increase the current
|
|
power management level, i.e. they can dim the display.
|
|
|
|
|
|
Volume control -- /proc/acpi/ibm/volume
|
|
---------------------------------------
|
|
|
|
This feature allows volume control on ThinkPad models which don't have
|
|
a hardware volume knob. The available commands are:
|
|
|
|
echo up >/proc/acpi/ibm/volume
|
|
echo down >/proc/acpi/ibm/volume
|
|
echo mute >/proc/acpi/ibm/volume
|
|
echo 'level <level>' >/proc/acpi/ibm/volume
|
|
|
|
The <level> number range is 0 to 15 although not all of them may be
|
|
distinct. The unmute the volume after the mute command, use either the
|
|
up or down command (the level command will not unmute the volume).
|
|
The current volume level and mute state is shown in the file.
|
|
|
|
Fan control and monitoring: fan speed, fan enable/disable
|
|
---------------------------------------------------------
|
|
|
|
procfs: /proc/acpi/ibm/fan
|
|
sysfs device attributes: (hwmon) fan_input, pwm1, pwm1_enable
|
|
|
|
NOTE NOTE NOTE: fan control operations are disabled by default for
|
|
safety reasons. To enable them, the module parameter "fan_control=1"
|
|
must be given to thinkpad-acpi.
|
|
|
|
This feature attempts to show the current fan speed, control mode and
|
|
other fan data that might be available. The speed is read directly
|
|
from the hardware registers of the embedded controller. This is known
|
|
to work on later R, T, X and Z series ThinkPads but may show a bogus
|
|
value on other models.
|
|
|
|
Fan levels:
|
|
|
|
Most ThinkPad fans work in "levels" at the firmware interface. Level 0
|
|
stops the fan. The higher the level, the higher the fan speed, although
|
|
adjacent levels often map to the same fan speed. 7 is the highest
|
|
level, where the fan reaches the maximum recommended speed.
|
|
|
|
Level "auto" means the EC changes the fan level according to some
|
|
internal algorithm, usually based on readings from the thermal sensors.
|
|
|
|
There is also a "full-speed" level, also known as "disengaged" level.
|
|
In this level, the EC disables the speed-locked closed-loop fan control,
|
|
and drives the fan as fast as it can go, which might exceed hardware
|
|
limits, so use this level with caution.
|
|
|
|
The fan usually ramps up or down slowly from one speed to another, and
|
|
it is normal for the EC to take several seconds to react to fan
|
|
commands. The full-speed level may take up to two minutes to ramp up to
|
|
maximum speed, and in some ThinkPads, the tachometer readings go stale
|
|
while the EC is transitioning to the full-speed level.
|
|
|
|
WARNING WARNING WARNING: do not leave the fan disabled unless you are
|
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monitoring all of the temperature sensor readings and you are ready to
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enable it if necessary to avoid overheating.
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An enabled fan in level "auto" may stop spinning if the EC decides the
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ThinkPad is cool enough and doesn't need the extra airflow. This is
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normal, and the EC will spin the fan up if the varios thermal readings
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rise too much.
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On the X40, this seems to depend on the CPU and HDD temperatures.
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Specifically, the fan is turned on when either the CPU temperature
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climbs to 56 degrees or the HDD temperature climbs to 46 degrees. The
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fan is turned off when the CPU temperature drops to 49 degrees and the
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HDD temperature drops to 41 degrees. These thresholds cannot
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currently be controlled.
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The ThinkPad's ACPI DSDT code will reprogram the fan on its own when
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certain conditions are met. It will override any fan programming done
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through thinkpad-acpi.
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The thinkpad-acpi kernel driver can be programmed to revert the fan
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level to a safe setting if userspace does not issue one of the procfs
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fan commands: "enable", "disable", "level" or "watchdog", or if there
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are no writes to pwm1_enable (or to pwm1 *if and only if* pwm1_enable is
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set to 1, manual mode) within a configurable amount of time of up to
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120 seconds. This functionality is called fan safety watchdog.
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Note that the watchdog timer stops after it enables the fan. It will be
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rearmed again automatically (using the same interval) when one of the
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above mentioned fan commands is received. The fan watchdog is,
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therefore, not suitable to protect against fan mode changes made through
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means other than the "enable", "disable", and "level" procfs fan
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commands, or the hwmon fan control sysfs interface.
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Procfs notes:
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The fan may be enabled or disabled with the following commands:
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echo enable >/proc/acpi/ibm/fan
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echo disable >/proc/acpi/ibm/fan
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Placing a fan on level 0 is the same as disabling it. Enabling a fan
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will try to place it in a safe level if it is too slow or disabled.
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The fan level can be controlled with the command:
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echo 'level <level>' > /proc/acpi/ibm/fan
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Where <level> is an integer from 0 to 7, or one of the words "auto" or
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"full-speed" (without the quotes). Not all ThinkPads support the "auto"
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and "full-speed" levels. The driver accepts "disengaged" as an alias for
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"full-speed", and reports it as "disengaged" for backwards
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compatibility.
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On the X31 and X40 (and ONLY on those models), the fan speed can be
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controlled to a certain degree. Once the fan is running, it can be
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forced to run faster or slower with the following command:
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echo 'speed <speed>' > /proc/acpi/ibm/fan
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The sustainable range of fan speeds on the X40 appears to be from about
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3700 to about 7350. Values outside this range either do not have any
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effect or the fan speed eventually settles somewhere in that range. The
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fan cannot be stopped or started with this command. This functionality
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is incomplete, and not available through the sysfs interface.
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To program the safety watchdog, use the "watchdog" command.
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echo 'watchdog <interval in seconds>' > /proc/acpi/ibm/fan
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If you want to disable the watchdog, use 0 as the interval.
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Sysfs notes:
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The sysfs interface follows the hwmon subsystem guidelines for the most
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part, and the exception is the fan safety watchdog.
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Writes to any of the sysfs attributes may return the EINVAL error if
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that operation is not supported in a given ThinkPad or if the parameter
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is out-of-bounds, and EPERM if it is forbidden. They may also return
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EINTR (interrupted system call), and EIO (I/O error while trying to talk
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to the firmware).
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Features not yet implemented by the driver return ENOSYS.
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hwmon device attribute pwm1_enable:
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0: PWM offline (fan is set to full-speed mode)
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1: Manual PWM control (use pwm1 to set fan level)
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2: Hardware PWM control (EC "auto" mode)
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3: reserved (Software PWM control, not implemented yet)
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Modes 0 and 2 are not supported by all ThinkPads, and the
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driver is not always able to detect this. If it does know a
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mode is unsupported, it will return -EINVAL.
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hwmon device attribute pwm1:
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Fan level, scaled from the firmware values of 0-7 to the hwmon
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scale of 0-255. 0 means fan stopped, 255 means highest normal
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speed (level 7).
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This attribute only commands the fan if pmw1_enable is set to 1
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(manual PWM control).
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hwmon device attribute fan1_input:
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Fan tachometer reading, in RPM. May go stale on certain
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ThinkPads while the EC transitions the PWM to offline mode,
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which can take up to two minutes. May return rubbish on older
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ThinkPads.
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driver attribute fan_watchdog:
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Fan safety watchdog timer interval, in seconds. Minimum is
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1 second, maximum is 120 seconds. 0 disables the watchdog.
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To stop the fan: set pwm1 to zero, and pwm1_enable to 1.
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To start the fan in a safe mode: set pwm1_enable to 2. If that fails
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with EINVAL, try to set pwm1_enable to 1 and pwm1 to at least 128 (255
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would be the safest choice, though).
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EXPERIMENTAL: WAN
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-----------------
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procfs: /proc/acpi/ibm/wan
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sysfs device attribute: wwan_enable
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This feature is marked EXPERIMENTAL because the implementation
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directly accesses hardware registers and may not work as expected. USE
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WITH CAUTION! To use this feature, you need to supply the
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experimental=1 parameter when loading the module.
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This feature shows the presence and current state of a W-WAN (Sierra
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Wireless EV-DO) device.
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It was tested on a Lenovo Thinkpad X60. It should probably work on other
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Thinkpad models which come with this module installed.
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Procfs notes:
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If the W-WAN card is installed, the following commands can be used:
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echo enable > /proc/acpi/ibm/wan
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echo disable > /proc/acpi/ibm/wan
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Sysfs notes:
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If the W-WAN card is installed, it can be enabled /
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disabled through the "wwan_enable" thinkpad-acpi device
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attribute, and its current status can also be queried.
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enable:
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0: disables WWAN card / WWAN card is disabled
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1: enables WWAN card / WWAN card is enabled.
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Note: this interface will be probably be superseeded by the
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generic rfkill class, so it is NOT to be considered stable yet.
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Multiple Commands, Module Parameters
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------------------------------------
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Multiple commands can be written to the proc files in one shot by
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separating them with commas, for example:
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echo enable,0xffff > /proc/acpi/ibm/hotkey
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echo lcd_disable,crt_enable > /proc/acpi/ibm/video
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Commands can also be specified when loading the thinkpad-acpi module,
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for example:
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modprobe thinkpad_acpi hotkey=enable,0xffff video=auto_disable
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Enabling debugging output
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-------------------------
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The module takes a debug paramater which can be used to selectively
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enable various classes of debugging output, for example:
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modprobe ibm_acpi debug=0xffff
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will enable all debugging output classes. It takes a bitmask, so
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to enable more than one output class, just add their values.
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Debug bitmask Description
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0x0001 Initialization and probing
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0x0002 Removal
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There is also a kernel build option to enable more debugging
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information, which may be necessary to debug driver problems.
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The level of debugging information output by the driver can be changed
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at runtime through sysfs, using the driver attribute debug_level. The
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attribute takes the same bitmask as the debug module parameter above.
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Force loading of module
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-----------------------
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If thinkpad-acpi refuses to detect your ThinkPad, you can try to specify
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the module parameter force_load=1. Regardless of whether this works or
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not, please contact ibm-acpi-devel@lists.sourceforge.net with a report.
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Sysfs interface changelog:
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0x000100: Initial sysfs support, as a single platform driver and
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device.
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0x000200: Hot key support for 32 hot keys, and radio slider switch
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support.
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0x010000: Hot keys are now handled by default over the input
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layer, the radio switch generates input event EV_RADIO,
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and the driver enables hot key handling by default in
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the firmware.
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