Android devices come with a built-in brightness control, but it can be difficult to get it to work properly. Here are some tips to help you lock the brightness on your Android device:

  1. Make sure your device is turned off and unplugged.
  2. Open the Settings app and scroll down to the bottom of the screen.
  3. Under “Device,” find “Brightness.”
  4. Toggle the “On” checkbox and press OK.
  5. Close the Settings app and plug in your device again.