由于台式的Android设备，存在着两个屏幕显示的情况，故需要对Android系统开发一个可以调节副屏亮度的功能。
提交副屏亮度调节的效果如下：
涉及修改的文件如下：
java
frameworks/base/services/core/java/com/android/server/am/ActivityManagerService.java
frameworks/base/services/core/java/com/android/server/wm/DisplayPolicy.java
vendor/mediatek/proprietary/packages/apps/MtkSettings/res/values-zh-rCN/strings.xml
vendor/mediatek/proprietary/packages/apps/MtkSettings/res/values-zh-rHK/strings.xml
vendor/mediatek/proprietary/packages/apps/MtkSettings/res/values-zh-rTW/strings.xml
vendor/mediatek/proprietary/packages/apps/MtkSettings/res/values/strings.xml
vendor/mediatek/proprietary/packages/apps/MtkSettings/res/xml/display_settings.xml
vendor/mediatek/proprietary/packages/apps/MtkSettings/src/com/android/settings/DisplaySettings.java
vendor/mediatek/proprietary/packages/apps/MtkSettings/src/com/android/settings/display/BrightnessLevelPreferenceController.java
vendor/mediatek/proprietary/packages/apps/MtkSettings/src/com/android/settings/display/BrightnessLevelPreferenceController2.java
vendor/mediatek/proprietary/packages/apps/SystemUI/AndroidManifest.xml
vendor/mediatek/proprietary/packages/apps/SystemUI/src/com/android/systemui/dagger/DefaultActivityBinder.java
vendor/mediatek/proprietary/packages/apps/SystemUI/src/com/android/systemui/qs/QSPanel.java
vendor/mediatek/proprietary/packages/apps/SystemUI/src/com/android/systemui/qs/QSPanelController.java
vendor/mediatek/proprietary/packages/apps/SystemUI/src/com/android/systemui/settings/brightness/BrightnessController2.java
vendor/mediatek/proprietary/packages/apps/SystemUI/src/com/android/systemui/settings/brightness/BrightnessDialog.java
vendor/mediatek/proprietary/packages/apps/SystemUI/src/com/android/systemui/settings/brightness/BrightnessDialog2.java