https://bugs.kde.org/show_bug.cgi?id=499533
Bug ID: 499533
Summary: Frequently toggling fullscreen causing window
flickering
Classification: Plasma
Product: kwin
Version: 6.2.5
Platform: Manjaro
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: compositing
Assignee: kwin-bugs-n...@kde.org
Reporter: wlmq...@qq.com
Target Milestone: ---
Created attachment 177981
--> https://bugs.kde.org/attachment.cgi?id=177981&action=edit
OBSERVED RESULT: flickering when toggling full-screen
SUMMARY
If I continuously press full-screen toggling shortcut, frequently switch
between full-screen modes, occasionally the underlying window is revealed,
causing flickering.
Regarding the use case, there isn’t any particular scenario that demands rapid
switching full-screen. So not a big deal anyway. Just Kwin would be better
without the flickering.
STEPS TO REPRODUCE
For firefox:
1. Open Firefox
2. Toggle fullscreen mode frequently (For firefox it’s long-press F11)
For other app (like mpv or konsole):
1. Bind fullscreen shortcut key to whatever U like.
2. Rapidly tap the full screen key (long-pressing seems works too).
OBSERVED RESULT
There will be split-second of exposing the window underneath the current one,
causing flickering.
See upload gif:OBSERVED_RESULT.gif
EXPECTED RESULT
Getting window always showup and follow right z-index when switching
full-screen mode.
For comparison, There is a Win11 24h2 one. Win11 not behave the best, there
also some drawback on compositor.
See upload gif:EXPECTED_RESULT.gif
SOFTWARE/OS VERSIONS
Windows: Not affected
macOS: Not affected
Linux/KDE Plasma: Manjaro KDE Plasma 6.2.5 Wayland and X11
KDE Plasma Version: 6.2.5
KDE Frameworks Version: 6.10.0
Qt Version: 6.8.1
Kernel Version: 6.13.0-1-MANJARO (AMD64)
ADDITIONAL INFORMATION
Initial conversation:
https://discuss.kde.org/t/frequently-toggling-fullscreen-causing-window-flickering/29153
Can reproduced on both:
AMD 7840HS Laptop
AMD Ryzen 3700x, Radeon Vega56 platform
More system information, See upload txt: inxi.txt
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