https://bugs.kde.org/show_bug.cgi?id=515297
Bug ID: 515297
Summary: REGRESSION: Intermittent but frequent plasmashell
freeze on X11 when clicking grouped task icons -
VirtualBox (Plasma 6.5.5 / KF 6.22)
Classification: Plasma
Product: plasmashell
Version First 6.5.5
Reported In:
Platform: Neon
OS: Linux
Status: REPORTED
Severity: major
Priority: NOR
Component: Task Manager and Icons-Only Task Manager widgets
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Target Milestone: 1.0
STEPS TO REPRODUCE:
Start a Plasma session on X11 inside a VirtualBox VM (3D Acceleration
DISABLED).
Open multiple windows of the same application (e.g., Konsole or Dolphin) to
trigger grouping in the Task Manager.
Click on the grouped icon to open the window selection popup.
Repeat if it doesn't happen the first time.
OBSERVED RESULT: The entire plasmashell process freezes. The mouse cursor
remains movable and other windows stay interactive, but the panel/taskbar is
completely unresponsive.
FREQUENCY: The issue is intermittent but occurs very frequently (highly
reproducible). It doesn't happen 100% of the time, but it happens often enough
to make the desktop nearly unusable without frequent restarts of the shell.
EXPECTED RESULT: The window selection popup should appear smoothly every time
without freezing the shell.
REGRESSION INFORMATION: This issue started appearing approximately one week
ago, following the latest updates. It was working correctly before the
transition to the current versions of Plasma, Frameworks, and Qt. It feels like
a race condition in the Task Group Dialog rendering on X11 under software
rendering (llvmpipe).
ENVIRONMENT / VERSIONS:
Virtualization: VirtualBox [7.2.4] (No 3D Acceleration)
Guest OS: KDE neon (User Edition)
Graphics Platform: X11
KDE Plasma Version: 6.5.5
KDE Frameworks Version: 6.22.0
Qt Version: 6.10.1
ADDITIONAL NOTES:
I have already tried disabling "Thumbnails" in the Task Manager settings, but
the freeze persists.
Since I am using a VM without 3D acceleration, the system is using software
rasterization.
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