Game "Brightness" is Locked in Fullscreen
4.5
The brightness slider in the game does nothing when you are in Fullscreen mode.
Symptoms
- Slider doesn't work
- Stuck brightness
- Cannot adjust
Possible Causes
- Windows "Auto-HDR"
- Monitor OSD override
- DirectX 12 limitation
Step-by-Step Fix
1
Switch to "Borderless Windowed"
Allows Windows to handle the brightness instead of the game.
2
Disable "Auto-HDR"
Windows Settings > Display > HDR > Turn off Auto-HDR.
3
Adjust via GPU Control Panel
Use NVIDIA/AMD settings to force a brightness/gamma change.
When to See a Technician
In DX12, many traditional "gamma" controls are disabled in favor of system-level HDR management.
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