https://bugs.kde.org/show_bug.cgi?id=511010
Bug ID: 511010
Summary: Video playback causes graphical corruption on panel
applets
Classification: Plasma
Product: plasmashell
Version First 6.5.0
Reported In:
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Panel
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Target Milestone: 1.0
SUMMARY
While playing back a video (reproduced both in Firefox on YouTube and in mpv
playing local 1080p BD rip), graphical corruption (flickering squares of
whatever is behind the panel) can be observed on at least task manager applet
and system tray applet. The video being played has to be visible on the screen.
STEPS TO REPRODUCE
1. Open Firefox
2. Navigate to YouTube
3. Play any video
4. Optionally either move cursor over the task bar or scroll in the Firefox
window to more reliably trigger the corruption. However I have observed it even
when not doing this.
OBSERVED RESULT
Corrupted graphics flickering over task manager applet
EXPECTED RESULT
No graphical corruption
SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 6.5.0
KDE Frameworks Version: 6.19.0
Qt Version: 6.10.0
Kernel Version: 6.17.5-arch1-1 (64-bit)
Graphics Platform: Wayland
Graphics Processor: NVIDIA GeForce RTX 4080 SUPER
Driver version: 580.95.5
ADDITIONAL INFORMATION
Most reliable reproduction is with Firefox. While playing a video in MPV the
effect can occur, however the effect seemed to be much less pronounced and
appeared less frequently. Issue occured at different scaling settings
(including no scaling), different video HW acceleration settings and both with
VRR enabled and disabled. The graphical corruption is not visible in
screenshots or OBS screen recordings. The issue occurs even with KWin
compositing set to QPainter. When using QPainter, the corrupted area seems to
respond to another window approaching the panel and resizes based on the
distance of the second window and its size. In this case the corrupted area is
always rectangular and seems to only appear in the second half of the panel.
Regardless of the compositing used, if another HW accelerated surface is under
the panel (e.g. a Konsole window), the corruption seems to also spread to this
surface. I could not reproduce this by overlaying other windows, only with the
panel. Putting Dolphin under the panel did not cause any corruption to the
Dolphin window. Issue is not new in 6.5, I can also reproduced it in 6.4.5.
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