Bug 504272 - Screen flicker when hovering mouse to other monitor in fullscreen application
Summary: Screen flicker when hovering mouse to other monitor in fullscreen application
Status: RESOLVED DUPLICATE of bug 500433
Alias: None
Product: kwin
Classification: Plasma
Component: multi-screen (other bugs)
Version First Reported In: 6.3.5
Platform: Arch Linux Linux
: NOR normal
Target Milestone: ---
Assignee: KWin default assignee
URL:
Keywords: multiscreen, regression
Depends on:
Blocks:
 
Reported: 2025-05-15 14:51 UTC by kacper.kontny
Modified: 2025-05-18 20:52 UTC (History)
3 users (show)

See Also:
Latest Commit:
Version Fixed/Implemented In:
Sentry Crash Report:

Attachments
firefox fullscreen flickering (2.13 MB, video/mp4)
2025-05-15 14:51 UTC, kacper.kontny 		Details
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Description kacper.kontny 2025-05-15 14:51:49 UTC 
Created attachment 181338 [details]
firefox fullscreen flickering

When an application is running in fullscreen and cursor is moved to other monitor, the screen on which the application is opened flickers once when leaving the monitor area, and also when entering the same. If fullscreen applications are opened on both monitors, both monitors flicker.

Interestingly, when "Show FPS" option is enabled from Desktop Effects, the issue no longer persists. Video attached with Firefox in fullscreen on one monitor. Issue is also noticeable in other apps. Running applications using e.g. gamescope also mitigates the flickering.

Downgrading kwin to 6.3.4-4 fixes the issue.

reproducible on versions:
kwin 6.3.5-1
wayland 1.23.1-2
linux 6.14.6.arch1-1
mesa 1:25.0.5-1
Comment 1 John Kizer 2025-05-18 20:52:30 UTC 
Hi - merging this in with the existing bug report where this issue is being investigated - thanks!

*** This bug has been marked as a duplicate of bug 500433 ***