1. From the home screen, swipe down from the Notifications bar.
   
2. Tap the Settings icon.
   
3. Scroll to then tap Display & gestures.
   
4. Tap Brightness.
   
5. Tap Automatic brightness.
   Note: Leave Automatic brightness enabled to optimize battery life.
   
6. Drag the slider to the desired level, then tap OK.
   
7. Tap Sleep.
   
8. Tap the desired screen timeout time.
   
9. To enable or disable screen rotation, tap Auto-rotate screen.