https://bugs.kde.org/show_bug.cgi?id=455675
Bug ID: 455675
Summary: Firefox (and other apps) strobe on resize - failed
repaint?
Product: kwin
Version: 5.25.0
Platform: Archlinux Packages
OS: Linux
Status: REPORTED
Severity: major
Priority: NOR
Component: compositing
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
SUMMARY
Certain resize actions trigger strobing/flickering where the window "used to
be". Per reports, this bug affects Firefox, Thunderbird, and Qalculate.
KDE 5.25 introduced this issue. Issue occurs in X11 across both AMD and NVIDIA
(proprietary) graphics.
The only known workaround is to suspend compositing (default Alt+Shift+F12),
which mitigates the issue entirely.
I'm marking this as a major bug, since the strobing is severe and the
workaround isn't great.
Other reported instances of this bug (both Arch and KDE Neon):
https://bbs.archlinux.org/viewtopic.php?id=277368
https://old.reddit.com/r/kdeneon/comments/ved17h/this_started_happening_after_a_big_update_is_it_a/
STEPS TO REPRODUCE
1. Launch Firefox, Thunderbird, or Qalculate.
2. Resize/edge snap/fullscreen the app window.
3. Observe strobing where app hasn't been repainted.
OBSERVED RESULT
Flicker, per attached video.
EXPECTED RESULT
No flicker.
SOFTWARE/OS VERSIONS
For my machine ~
Operating System: Arch Linux
KDE Plasma Version: 5.25.0
KDE Frameworks Version: 5.95.0
Qt Version: 5.15.5
Kernel Version: 5.18.5-arch1-1 (64-bit)
Graphics Platform: X11
Processors: 8 × Intel® Core™ i7-7700K CPU @ 4.20GHz
Memory: 31.3 GiB of RAM
Graphics Processor: NVIDIA GeForce GTX 1080 Ti/PCIe/SSE2
ADDITIONAL INFORMATION
Attempted mitigation steps, none of which work:
- Disable hardware acceleration in Firefox
- Disable all Kwin scripts
- Disable desktop effects
- Power off all monitors besides primary
- Adjust system animation speed
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