diff --git a/src/backthread.cpp b/src/backthread.cpp
index 83f9648c..078bf21a 100644
--- a/src/backthread.cpp
+++ b/src/backthread.cpp
@@ -236,6 +236,8 @@ void BackThread::execConnLan(QString connName)
         syslog(LOG_DEBUG, "In function execConnLan, wired net state is: %d", execGetIface()->lstate);
         emit connDone(0);
     } else {
+        qDebug()<<"connect wired network failed for without wired cable plug in.";
+        syslog(LOG_DEBUG, "connect wired network failed for without wired cable plug in.");
         emit connDone(1);
     }
 
diff --git a/src/kylin-dbus-interface.cpp b/src/kylin-dbus-interface.cpp
index b3a72262..2e069af7 100644
--- a/src/kylin-dbus-interface.cpp
+++ b/src/kylin-dbus-interface.cpp
@@ -415,7 +415,7 @@ void KylinDBus::initConnectionInfo()
     // qDebug()<<"             ";
 
 
-    //获取当前wifi是否连接
+    //获取当前wifi的开关状态
     QDBusReply<QVariant> m_result = interface.call("Get", "org.freedesktop.NetworkManager", "WirelessEnabled");
     qDebug()<<"debug: *****初始的无线网络开关状态是: "<<m_result.value().toBool();
     oldWifiSwitchState = m_result.value().toBool();
@@ -712,8 +712,12 @@ void KylinDBus::getWifiSwitchState()
                 bool judge = getSwitchStatus(key);
                 if (judge) {
                     mw->onBtnWifiClicked(1); //打开wifi开关
+                    qDebug()<<"receive a signal to turn on wifi switch from control-center";
+                    syslog(LOG_DEBUG, "receive a signal to turn on wifi switch from control-center");
                 } else {
                     mw->onBtnWifiClicked(2); //关闭wifi开关
+                    qDebug()<<"receive a signal to turn off wifi switch from control-center";
+                    syslog(LOG_DEBUG, "receive a signal to turn off wifi switch from control-center");
                 }
             }
         });
diff --git a/src/main.cpp b/src/main.cpp
index 9414d983..d6195efd 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -25,16 +25,24 @@
 #include <QLocale>
 #include <QApplication>
 #include <QDebug>
+#include <QDesktopWidget>
 
 #define LOG_IDENT "ukui_kylin_nm"
 
 
 int main(int argc, char *argv[])
 {
-    QGuiApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
+    //QGuiApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
 
     QApplication a(argc, argv);
 
+    if (QApplication::desktop()->width() >= 2560) {
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 6, 0))
+        QApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
+        QApplication::setAttribute(Qt::AA_UseHighDpiPixmaps);
+#endif
+    }
+
     openlog(LOG_IDENT, LOG_NDELAY | LOG_NOWAIT | LOG_PID, LOG_USER);
 
     syslog(LOG_DEBUG, "Kylin Network Manager Is Already Launched");
diff --git a/src/mainwindow.cpp b/src/mainwindow.cpp
index d3b4bdae..0c233dc6 100644
--- a/src/mainwindow.cpp
+++ b/src/mainwindow.cpp
@@ -1135,6 +1135,8 @@ void MainWindow::onBtnWifiClicked(int flag)
 
         QString txt(tr("please insert the wireless network adapter"));
         objKyDBus->showDesktopNotify(txt);
+        qDebug()<<"please insert the wireless network adapter";
+        syslog(LOG_DEBUG, "please insert the wireless network adapter");
         //QString cmd = "export LANG='en_US.UTF-8';export LANGUAGE='en_US';notify-send '" + txt + "' -t 3800";
         //int status = system(cmd.toUtf8().data());
         //if (status != 0){ syslog(LOG_ERR, "execute 'notify-send' in function 'onBtnWifiClicked' failed");}
@@ -2339,10 +2341,12 @@ void MainWindow::onExternalWifiSwitchChange(bool wifiEnabled)
     if (!is_stop_check_net_state) {
         is_stop_check_net_state = 1;
         if (wifiEnabled) {
-            qDebug()<<"debug: ccccccccccccccccccccccccccccccccc";
+            qDebug()<<"debug: external wifi switch turn on";
+            syslog(LOG_DEBUG, "debug: external wifi switch turn on");
             QTimer::singleShot(4*1000, this, SLOT(onExternalWifiChange() ));
         } else {
-            qDebug()<<"debug: ddddddddddddddddddddddddddddddddd";
+            qDebug()<<"debug: external wifi switch turn off";
+            syslog(LOG_DEBUG, "debug: external wifi switch turn off");
             QTimer::singleShot(3*1000, this, SLOT(onExternalWifiChange() ));
         }
     }