Some Windows 10 users have reported that their screen brightness changes automatically or does not work properly. They can’t adjust the brightness. If Windows 10 Brightness is not working or changes automatically on your computer system, then this post will help you troubleshoot & fix the problem.
Windows 10 Brightness not working
Please go through the entire list and then decide which of the suggestions you would like to try and decide the order you want to try them.
Open Control Panel > All Control Panel Items > Power Options > Edit Plan Settings and restore the default power plan settings by clicking on Restore default settings for this plan. Do this for all your Power Plans.
3] Disable Adaptive Brightness
Disable Adaptive Brightness and see. Open Control Panel > Power Options. Open your active power plan and select Change plan settings option to open the Edit Plan Settings window. Now click Change advanced power settings option to open the Power Options dialog. Next, expand Display and then expand Enable Adaptive Brightness. Set it to Off.
4] Disable the Intel Power Saving Technology
If your laptop used Intel processors, disable the Intel Power Saving Technology. You will get this setting in your Dell or Vaio Control Center. More on this at this Computer screen brightness flickering post.
5] Disable BrightnessReset Task
Open Task Scheduler using Start Search. In the left pane, you will see Task Scheduler Library. Navigate to Microsoft > Windows > Display > Brightness.
In the right pane, if you see a scheduled task called BrightnessReset, double-click on it > Properties > Triggers tab > Edit. Now disable it and see if it works for you.
If it does not help, you may re-enable it.
6] Run Power Troubleshooter
Run the built-in Power Troubleshooter and see it helps you. You may access it via the Windows 10 Troubleshooters Settings Page or run the following command directly to bring up the built-in Power Troubleshooter
msdt.exe /id PowerDiagnostic
Once you hit Enter, you will see the Power Troubleshooter pop-up. Similarly, if you know the Diagnostic Pack ID of any Troubleshooter, you will be able to invoke it using the command line.
Anand Khanse is the Admin of TheWindowsClub.com, a 10-year Microsoft MVP Awardee in Windows (2006-16) & a Windows Insider MVP since then. Please read the entire post & the comments first, create a System Restore Point before making any changes to your system & be careful about any 3rd-party offers while installing freeware.