https://bugs.kde.org/show_bug.cgi?id=436902
Bug ID: 436902
Summary: Stutter on notification appearing/disappearing with
Nvidia driver
Product: kwin
Version: 5.21.4
Platform: Debian unstable
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: compositing
Assignee: kwin-bugs-n...@kde.org
Reporter: grzesiek.jedenas...@outlook.com
Target Milestone: ---
SUMMARY
The entire desktop stutters when a notification appears (and when it
disappears).
Video: https://youtu.be/V_DPYOPAvCE
Seems to only happen with the Nvidia driver.
STEPS TO REPRODUCE
1. Open glxgears or similar, it can help to use mangohud to make the stutter
more visible (it shows a performance graph).
2. Open Konsole and run:
while true; do notify-send -t 2000 test; sleep 2; done
in the shell. This will spam some notifications for you.
3. Move some windows around
OBSERVED RESULT
glxgears stutters, and so does the entire desktop (moving windows).
EXPECTED RESULT
Nothing special happens, no stutter.
SOFTWARE/OS VERSIONS
Operating System: Debian GNU/Linux 11 (Sid)
KDE Plasma Version: 5.21.5
KDE Frameworks Version: 5.81.0
Qt Version: 5.15.2
Kernel Version: 5.11.0-19.1-liquorix-amd64
OS Type: 64-bit
Graphics Platform: X11
Processors: 4 × Intel® Core™ i5-2400 CPU @ 3.10GHz
Memory: 7.7 GiB of RAM
Graphics Processor: GeForce GTX 660/PCIe/SSE2 (MSI GeForce GTX660 TWINFROZR
III)
Nvidia Driver Version: 460.73.01
ADDITIONAL INFORMATION
I can't reproduce it on a Thinkpad x240 that has an Intel iGPU, but it is the
case on my PC with Nvidia GTX 660.
It's irritating while playing games and noticeable while just using the
desktop.
There also is some stutter when opening/closing windows, but I don't know if
this is related, and it isn't that extreme.
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