https://bugs.kde.org/show_bug.cgi?id=494386
Bug ID: 494386
Summary: [Icons-Only Task Manager] option of "Multi-row View -
When panel is low on space and thick enough" causes
shell to crash-loop on startup
Classification: Plasma
Product: plasmashell
Version: 6.2.0
Platform: Fedora RPMs
OS: Linux
Status: REPORTED
Severity: crash
Priority: NOR
Component: Panel
Assignee: plasma-b...@kde.org
Reporter: q...@mailbox.org
CC: niccolo.venera...@gmail.com
Target Milestone: 1.0
SUMMARY
This was occurring on the latest 6.1.x and 6.2 update on Fedora, so I don't
believe it was a regression from any update.
The visual bug is that it flickers between "full size" and "short/thick
multi-row" which then hangs the plasma shell and causes major system lag, even
causing screen flickering on tty sessions.
STEPS TO REPRODUCE
1. Panel is set to "Fit content"
2. Icon-only Task Manager is set to "Use Multi-row view: When panel is low on
space and thick enough."
3. Log out/reboot system.
4. Log back into Plasma Desktop.
OBSERVED RESULT
The panel on start up expands to fill to the content on startup, which then
counts itself as "low space, thick" and then attempts to draw rows and columns.
It finishes the expansion, but still tries to use multi-row. This disagreement
causes the panel to flicker between the two settings, hanging the shell/desktop
in place. Krunner and other applications still function, you just can't dismiss
notifications, use the panel's menu, or anything related with the panel's
function.
Upon entering a tty session to attempt to debug, the tty session flickers
between blank and the drawn terminal.
EXPECTED RESULT
The panel loads as normal, enabling full login and normal use.
SOFTWARE/OS VERSIONS
Operating System: Fedora Linux 40
KDE Plasma Version: 6.2.0
KDE Frameworks Version: 6.6.0
Qt Version: 6.7.2
Kernel Version: 6.10.12-200.fc40.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 8 × Intel® Core™ i5-8350U CPU @ 1.70GHz
Memory: 15.5 GiB of RAM
Graphics Processor: Mesa Intel® UHD Graphics 620
[queue@wanderer]~%
ADDITIONAL INFORMATION
After leaving the desktop alone while I was looking to see if this issue was a
new issue or had a solution, it solved itself after a few minutes. I attempted
to capture the panel flickering on video, but my phone couldn't see the rapid
redrawing, I assume due to anti-banding. I have videos I can upload if needed.
If I had to guess (by observation, no dmesg/journalctl messages went off during
this as far as I can tell), when this setting is enabled:
- The shell launches
- The panel launches
- It detects the setting is made to double up if its short and thick enough
- During the setting being detected, the panel is being drawn
- The panel being drawn is both short enough to stay one row, and thick enough
to draw columns
- The two disagree, causing the panel to to rapidly draw between the two
options, freezing the shell.
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