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Software brightness upscaling flickers or upscaling briefly goes away every every 10-15 seconds with full screen windows #4458

@CookiePl

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@CookiePl
  1. Using mac OS 26 beta 2
  2. BD 4.0.0 (42564)

When I switch the app to full screen instead of maximizing it, and use the app, it shows a slightly darker screen instead of the upscaled brightness.

How to reproduce:

  1. Enable monitor hdr
  2. Enable brightness upscaling
  3. Turn on any app in full screen (Safari, Finder, etc.)
  4. Navigate by scrolling, etc., and stay still for about 10 seconds.
  5. The screen shows a slightly darker screen instead of the upscaled brightness.

If you exit maximized or move to another desktop, brightness upscaling will be enabled again.

IMG_4077.mp4

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XDR/HDR/upscalingXDR, HDR and brightness upscaling related featuresbugSomething isn't workingdoneAll tasks are completedrelease availableAvailable under Releases (either as pre-release or stable release)

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