1. From the home screen, press the Menu key.
    device 2837/1429297.jpg
  2. Tap All settings.
    device 2837/1429296.jpg
  3. Under the 'Display' tab, tap the Auto-brightness checkbox to toggle Auto-brightness on/off.
    device 2837/1429295.jpg
  4. Drag the Brightness slider to adjust the brightness manually.
    device 2837/1429294.jpg
  5. Tap Screen timeout to set the screen timeout.
    device 2837/1429293.jpg
  6. Tap Auto-rotate screen to lock/unlock the screen orientation.
    device 2837/1429292.jpg