SUMMARY When an up hangs, KWin applies an internal effect called “Desaturate Unresponsive Applications”. This effect is not affected by the Night Color filter, which makes “desaturated” apps look strikingly blue. STEPS TO REPRODUCE Make some app detectably hang :) OBSERVED RESULT See the attached photo. EXPECTED RESULT The discoloration is not white-white, but red-white (: SOFTWARE/OS VERSIONS Operating System: openSUSE Tumbleweed 20240904 KDE Plasma Version: 6.1.4 KDE Frameworks Version: 6.5.0 Qt Version: 6.7.2 Kernel Version: 6.10.7-1-default (64-bit) Graphics Platform: Wayland Graphics Processor: NVIDIA GeForce RTX 4070/PCIe/SSE2 ADDITIONAL INFORMATION
Created attachment 173367 [details] Photo
A possibly relevant merge request was started @ https://invent.kde.org/plasma/kwin/-/merge_requests/6358
Can't reproduce, it looks exactly like it should here. I don't know how it could happen differently either, night light is applied after compositing has already happened, so it acts on all pixels the exact same. We *are* doing night light kind of wrong though, and the linked MR fixes that. Could you test if it changes anything for you?
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>A possibly relevant merge request was started @ https://invent.kde.org/plasma/kwin/-/merge_requests/6358 reporter claimed on the linked MR (which is not merged) that it did not fix the issue
Can you still replicate this issue on 6.3+?
Nope, seems to be gone :)
Meh, it's still there — reproduced with Zed today, attaching the screenshots of the issue: 1) Visible with GPU Screen Recorder 2) Not visible with Spectacle for some reason
Created attachment 184690 [details] How GPU Screen Recorder sees it
Created attachment 184691 [details] What Spectacle shows when making the screenshot
Created attachment 184692 [details] What Spectacle saves to the file
Created attachment 184693 [details] How I see it (behind is about:blank for comparison)
New system info: Operating System: openSUSE Tumbleweed 20250902 KDE Plasma Version: 6.4.4 KDE Frameworks Version: 6.17.0 Qt Version: 6.9.2 Kernel Version: 6.16.3-1-default (64-bit) Graphics Platform: Wayland Processors: 32 × Intel® Core™ i9-14900K Graphics Processor: NVIDIA GeForce RTX 4070