Please note that serious problems may occur if you do this incorrectly. This solution contains steps that are part of modifying the registry. Back up the registry before you modify it, then restore it if a problem occurs. If you’re still unable to adjust brightness on your laptop, try updating the registry.
Select the below registry and set FeatureTestControl DWORD’s value data to 0000ffff: Class000. Go to the Windows search bar and type Control Panel. This is the best way to avoid permanent damage to your PC by getting the right driver versions.Īlong with updating, DriverFix can also detect whether you have damaged drivers on your PC and automatically fix them. It is designed to do the whole driver downloading and installing job instead of you. You’ll have both the option to update several drivers at once, if needed, or choose the Update button next to each driver. The tool will show exactly what drivers need updating. If this does not work, we recommend trying a 3rd party driver updater.ĭriverFix is one of our top recommendations when it comes to updater software. 
#Windows 10 brightness slider not working install
Install the appropriate drivers missing from your laptop that can cause the brightness adjustment problem.
You can also try and get the latest drivers from your computer’s manufacturer website and download and install the latest display and chipset drivers.
Restart the computer after it’s updated and verified. 
Select the option to automatically search for the updated driver software. Right-click on the Display Adapter listed and click on Update Driver Software.
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