https://bugs.kde.org/show_bug.cgi?id=443341
Bug ID: 443341
Summary: Flickering and hanging on Nvidia starting at kwin_x11
5.22.90
Product: kwin
Version: 5.22.90
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: compositing
Assignee: kwin-bugs-n...@kde.org
Reporter: nyanpas...@tuta.io
Target Milestone: ---
SUMMARY
Around the time I upgraded to Plasma beta 5.22.90 (and nvidia 470.74), KWin
become substantially more unstable. Opening some apps caused black flickering
on most of the screen, and the screen froze when re-enabling compositing after
some time spent with it off.
STEPS TO REPRODUCE
For screen hang:
1. Keep compositing at OpenGL 2.0.
2. Turn off compositing using alt+shift+f12 or the equivalent shortcut. I find
kwin much more stable in this state.
3. Use the computer for some time.
4. Enable compositing using the keyboard shortcut.
OBSERVED RESULT
Screen stops updating except for cursor. If I switch to TTY and back, screen is
black except for cursor. I can still interact with windows despite screen not
redrawing, and restarting kwin_x11 (from Konsole or TTY) fixes the issue. (I'm
using systemd user boot for Plasma, so that's systemctl --user restart
plasma-kwin_x11.)
Full-screen flickering is more random, and is triggered by launching certain
application windows (generally GPU-accelerated ones like QML-based System
Settings, or gtk4-demo's "Automatic Scrolling"). If you're unlucky, the rest of
the screen will flash between the intended contents and black on every 2 or 3
frames, until the window is closed. (IIRC dragging the window around stopped
flickering around wherever you dragged the window.) Reopening the window will
generally trigger the bug again. Restarting kwin_x11 will prevent the bug from
happening even with the same apps, for some time.
Sometimes KDE will turn off compositing because it detects OpenGL-related
crashes.
EXPECTED RESULT
Compositing works.
SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 5.22.90
KDE Frameworks Version: 5.86.0
Qt Version: 5.15.2
Kernel Version: 5.14.8-zen1-1-zen (64-bit)
Graphics Platform: X11
Processors: 12 × AMD Ryzen 5 5600X 6-Core Processor
Memory: 15.6 GiB of RAM
Graphics Processor: NVIDIA GeForce GT 730/PCIe/SSE2
pacman says I installed nvidia 470.74 around the same time as kwin 5.22.90. I'm
not sure which caused the issue.
ADDITIONAL INFORMATION
Bug 424311 has been filed for a while now, but it seems similar.
I have KWIN_DRM_USE_EGL_STREAMS set, but this didn't change between "before"
and "after" I saw the bug.
I don't think I have a kwin_env.sh in place, and I don't see
__GL_NO_DSO_FINALIZER set (though I know I experimented with it in the past, in
a failed attempt to fix the KWin shutdown hang where when you log out or
shutdown, KWin burns a CPU core because it's stuck in Nvidia's
/usr/lib/libGLX_nvidia.so.0 in a lock cmpxchg loop, I suspect waiting for a
spinlock).
Should I report the KWin hang bug, here or to Nvidia? I'm not sure if it still
occurs.
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