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Whenever I go to settings and to display, the brightness and the sleep buttons are faded out and I can't click them. I tried rebooting my phone and a factory reset but nothing works. I don't know what to do as I can't adjust my phone brightness or the sleep time. I'm using an Alcatel Pixi 3 (4.5) and it's running on KitKat 4.4.

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    It's a weird problem. For now, you can use adb commands to change screen brightness, check this answer – Lucky Oct 7 '15 at 11:43
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Go to sitting then barrery manager and turn off that feature you should be able to adjust your brightness and time out features then it's that simple

  • Same solution is valid on Android 7 – Scott Stensland Jan 30 '18 at 17:38

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