https://bugs.kde.org/show_bug.cgi?id=448679
Bug ID: 448679
Summary: KWin (desktop effects) shutters picture into triangles
on Alt+Tab after sleep
Product: kwin
Version: git master
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: compositing
Assignee: kwin-bugs-n...@kde.org
Reporter: m...@ratijas.tk
Target Milestone: ---
SUMMARY
Sometimes after waking up from sleep, laptop's KWin/X11 session may randomly
break when switching apps via Alt+Tab.
The whole screen turns into randomly splattered triangles with rescaled and
mispositioned content of windows parts.
The glitch can be "fixed" by switching to another TTY and back, for example
pressing Ctrl+Alt+F2, Ctrl+Alt+F1. The fix is temporary, and it would glitch
out again soon. Permanent fix is to reboot and don't go into sleep mode.
STEPS TO REPRODUCE
1. Boot up Plasma/X11, put system to sleep, and wake it up.
2. Switch apps via Alt+Tab (not consistent, likely won't work on a first try)
OBSERVED RESULT
Shuttered screed full of triangle artifacts.
EXPECTED RESULT
uhm… not this, I can tell 'ya that much.
SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 5.24.80
KDE Frameworks Version: 5.91.0
Qt Version: 5.15.2
Kernel Version: 5.16.0-arch1-1 (64-bit)
Graphics Platform: X11
Processors: 8 × Intel® Core™ i7-6700HQ CPU @ 2.60GHz
Memory: 15.6 GiB of RAM
Graphics Processor: NVIDIA GeForce GTX 970M/PCIe/SSE2
ADDITIONAL INFORMATION
I recorded the glitch on a phone's camera:
- https://www.youtube.com/watch?v=cI-AB1lCobY
- https://www.youtube.com/watch?v=V7_2l8taH0E
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