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I have Moto G on Lollipop, and I mistakenly set the brightness bar to zero. Now, the screen is completely darkened and I'm not able to see anything.

How to set back the brightness to usable mode without hitting factory reset?

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    Are you sure you set it this way? I've never known a phone to go completely black if the bar is set to 0, usually it's just very dim.
    – New-To-IT
    Jan 30, 2015 at 17:47
  • yes i slided the brighness bar it went full dim. I have the lock screen, is it making it more darker? if i reboot the phone i can see the bootup animation and when it completes it goes dark. I can hear my ringtone if I get call. Jan 30, 2015 at 17:56
  • You didn't told us the whole story. Do you have stock ROM or custom ROM? How did you enable the possibility to achieve brightness level to 1 instead of 10?
    – jis
    Feb 3, 2015 at 22:49
  • I had the same problem. For the record: I shone something bright (e.g. a flashlight) on the light sensor, and then I saw the screen and could increase the brightness.
    – Renan
    Mar 18, 2015 at 14:17

4 Answers 4

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Had same problem. I believe the adaptive brightness auto adjust it to zero light.
I use another phone flash light and direct it on the the front camera and light sensor. Unlocking with power button awaken my screen with adjusted brightness.. Hope this will help...

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    You can go to a bright room or outside too. Angle the screen towards the light source and try to unlock the phone -- the screen will adjust. It may take a few tries. Then go to Settings -> Display and turn off the adaptive brightness. Pick a brightness level you like and then phone will be back to normal.
    – user92563
    Feb 2, 2015 at 1:46
  • worked like magic!!!
    – Cid
    Aug 27, 2015 at 12:48
  • bless you rudhra, we already wanted to return the phone :)
    – cincplug
    Jan 26, 2017 at 12:04
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Using ADB Tool, you can adjust the device brightness, by following command

adb shell settings put system screen_brightness 200

In order to get more info about what ADB is and other details refer the tag-wiki.

To Run below command, you need following:

  1. Computer/Laptop with with ADB Installed.
  2. Computer/Laptop Should recognize device when connected via USB. Install necessary device driver software to ensure device is detected by system.
  3. Connect device to Computer/Laptop using USB.
  4. Start command line program (like cmd in Windows or bash shell in Linux) and go to location where "adb" executable is placed, and run above mentioned command.
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  • I am getting adb installed will update once i try it. Thanks for your help. Jan 30, 2015 at 18:23
  • i am getting /system/bin/sh: settings: not found Jan 30, 2015 at 18:38
  • Looks like i have not enabled usb debugging on my phone :(. The reponse i got was from emulator running on my windows. Jan 30, 2015 at 18:58
  • You need to test this on device only!! you need to first make sure that your PC/ADB Detects your device via USB. Jan 30, 2015 at 19:01
  • @AADTechnical maybe you could edit your answer and include a short hint on the requirements? Not everyone is familiar with what ADB is. You could link to the adb tag-wiki for details (which also includes hints on its installation for "newcomers"). Thanks!
    – Izzy
    Jan 30, 2015 at 20:24
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Try to increase brightness in the same dark condition. Lock the phone using power button. Swipe up. Swipe down twice. Then try to move your finger left to right on the top 30% of your screen. Eventually you will be able to get your screen back. Do it patiently. It works. And be careful till this bug is fixed.

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I had to hard reset my phone to fix this problem.

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