https://bugs.kde.org/show_bug.cgi?id=490896
Bug ID: 490896
Summary: kwin enters a state in which it hangs for some time on
various effects
Classification: Plasma
Product: kwin
Version: 6.0.5
Platform: Manjaro
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: performance
Assignee: kwin-bugs-n...@kde.org
Reporter: darkinosun...@protonmail.com
Target Milestone: ---
Created attachment 172053
--> https://bugs.kde.org/attachment.cgi?id=172053&action=edit
A relevant part of journal
SUMMARY
When I wanted to ALT+TAB out of a gamescope window, the whole desktop hanged
for around 10-15 secs (even the mouse). I could not change VT either. I could
trigger this with ALT+TAB after this consistently, and with hovering over on
taskbar items (to show the hovered over window). Switching apps on taskbar via
the mouse (without letting the hover trigger) didn't cause a hang. Also I
noticed that on one of my monitors the framerate seemed normal (144Hz monitor),
but on the other one (60 Hz monitor) it was low, 20-30 ish. The hang did not
affect audio. There is some Pageflip timed out errors in the journal, so it
might be some kind of driver/kernel issue. kwin used around 60% CPU according
to htop (so it should be a single core)
The system had an uptime of 5 days without any problem, and this didn't happen
before either. Rebooting solved it, and now I can't make kwin go into this
state anymore.
Also, I'm not sure if I selected the correct component
STEPS TO REPRODUCE
I can't reproduce it now. But I did the following that triggered it somehow:
1. Start a game in gamescope with forced mouse capture
2. The given window is smaller than the screen resolution, however the mouse is
grabbed. Try to resize the window (it won't let you). Then try to maximize the
window
3. Press ALT+TAB
OBSERVED RESULT
Desktop hangs for 10-15 secs, and subsequent ALT+TABs hang it too.
EXPECTED RESULT
Desktop shouldn't hang.
SOFTWARE/OS VERSIONS
Operating System: Manjaro Linux
KDE Plasma Version: 6.0.5
KDE Frameworks Version: 6.3.0
Qt Version: 6.7.2
Kernel Version: 6.10.0-3-MANJARO (64-bit)
Graphics Platform: Wayland
Processors: 12 × AMD Ryzen 5 3600 6-Core Processor
Memory: 31.3 GiB of RAM
Graphics Processor: AMD Radeon RX 590 Series
The Kernel version was 6.9, but I have rebooted since then with the updated
kernel (other stuff was the same).
ADDITIONAL INFORMATION
I have some perf output, but it's too big for an attachment and I'm not sure
how I should cut some of it out
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