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[HDRP] Windowed Fullscreen Brightness Glitch

Solution

hdrpgraphicsdx12troubleshooting

Unity 6.0.x - Unity 6.3.x

Published Wed, Mar 11

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Reviewed by _architect

Chief Editor

80 posts
Issue

 A brightness issue occurs in your builds when using Windowed Fullscreen mode. When a display resolution other than the monitor native resolution is selected in your project, the entire scene becomes darker.

This behavior is specific to Windowed Fullscreen and does not occur in Exclusive Fullscreen or standard Windowed modes. This issue is prominent in projects using HDRP and DirectX 12.

Upgrade your Unity Editor to version 6000.0.69f1 or 6000.3.11f1 to resolve the darkening issue in Windowed Fullscreen.

Explanation

The scene darkening is caused by a bug in the DirectX 12 back-end when Screen.SetResolution() is called with non-native dimensions in Windowed Fullscreen.

  1. Open the Unity Hub and locate your project.
  2. Update your Unity Editor to version 6000.0.69f1, 6000.3.11f1, or a more recent stable release.
  3. Rebuild the application to apply the internal rendering fix.

Additional Tips

  • Confirm that your Graphics API is set to DirectX 12 in Project Settings.
  • If upgrading is delayed, use Exclusive Fullscreen to maintain consistent brightness across resolutions while avoiding Windowed Fullscreen for now.

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