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drm/i915: default to having backlight if VBT not available 

Apparently there are Apple laptops with magic smoke for a VBIOS, which
we fail to find and use. Default to having and setting up backlight in
this case.

This fixes a regression introduced by
commit c675949ec5
Author: Jani Nikula <jani.nikula@intel.com>
Date:   Wed Apr 9 11:31:37 2014 +0300

    drm/i915: do not setup backlight if not available according to VBT

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=77831
Reported-and-tested-by: Matteo Cypriani <mcy@lm7.fr>
Cc: stable@vger.kernel.org # 3.15+
Reviewed-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
This commit is contained in:
Jani Nikula 2014-06-17 15:47:05 +03:00
parent bfafe93a1c
commit 56c4b63aaf
1 changed files with 3 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/gpu/drm/i915/intel_bios.c
View File

@ -315,9 +315,6 @@ parse_lfp_backlight(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
const struct bdb_lfp_backlight_data *backlight_data;
const struct bdb_lfp_backlight_data_entry *entry;
/* Err to enabling backlight if no backlight block. */
dev_priv->vbt.backlight.present = true;
backlight_data = find_section(bdb, BDB_LVDS_BACKLIGHT);
if (!backlight_data)
return;
@ -1088,6 +1085,9 @@ init_vbt_defaults(struct drm_i915_private *dev_priv)
dev_priv->vbt.crt_ddc_pin = GMBUS_PORT_VGADDC;
/* Default to having backlight */
dev_priv->vbt.backlight.present = true;
/* LFP panel data */
dev_priv->vbt.lvds_dither = 1;
dev_priv->vbt.lvds_vbt = 0;