Watching movies on portable devices like Smartphones and tablets is a favorite pastime for many of us. But unforeseen trouble can kill all excitement. Nevertheless, it easy to get rid of the issue with little work.

Surface Pro keeps changing brightness

After playing a video or game for 5 to 10 seconds, the display may suddenly change to high brightness. One can’t figure out the exact value because the display percentage may continue to show the old percentage. First, 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 Once you hit Enter, you will see the Power Troubleshooter pop-up. Run it and see if that fixes the issue. If it does not the you will have to modify the Registry. It is therefore advisable to create a backup of your system before proceeding further.

Launch the ‘Run’ dialog box and type ‘Regedit’ in the empty field of the box. Press ‘Enter’. Now, navigate to the following path address – There, the following value should be visible to you – ‘FeatureTestControl’=dword:00009240. Change the above value highlighted in bold to 9250 (in hex) and exit the Registry Editor. Now, simply restart your computer and check if the issue persists. I hope this helps! Related reads:

Surface Pro keeps changing brightness when watching a video - 95