Brightness changes while "Adaptive Brightness" is disabled in Windows 8.1/10 with Intel HD Graphics

Solution 1:

Just found a suggestion that solved my problem here.

It is the Intel "Display Power Saving Technology" that is to blame.

Disable it like so:

1. Launch "Intel HD Graphics Control Panel" by right clicking and selecting "Graphics Properties..." from your Intel HD Graphics tray icon
2. Click Power
3. Choose "On battery"
4. Select "Disable" for Display Power Saving Technology
5. Click Apply

Solution 2:

Even after changing the "power" options in the "Intel HD graphics control panel" the brightness kept adapting to the image brightness/darkness.

So did some research and found a solution through editing the registry.

instructions:

1. press Win+r
2. type regedit and press Enter
3. navigate to HKEY_LOCAL_MACHINE\Software\Intel\Display\igfxcui\profiles\media\Brighten Movie and change ProcAmpBrightness to 0
4. also navigate to HKEY_LOCAL_MACHINE\Software\Intel\Display\igfxcui\profiles\media\Darken Movie and change ProcAmpBrightness to 0

This should solve the problem.