https://bugs.kde.org/show_bug.cgi?id=505336
Bug ID: 505336
Summary: Black Taskbar Under X11 after KVM Switch with
Unexisting Screen Rect -1 Error
Classification: Plasma
Product: plasmashell
Version First 6.3.4
Reported In:
Platform: Kubuntu
OS: Other
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: plasma-b...@kde.org
Reporter: nexisentertainm...@gmail.com
CC: k...@davidedmundson.co.uk
Target Milestone: 1.0
Created attachment 182091
--> https://bugs.kde.org/attachment.cgi?id=182091&action=edit
`plasmashell --replace 2>&1 | tee plasmashell.log` output
SUMMARY
I use a StarTech SV431HDU3A2 4-port KVM Switch to switch between PCs and
servers in my homelab. When switching to another input on Kubuntu 25.04
Plucky, plasmashell goes black (taskbar vanishes, windows are unaffected) and
must be restarted with either `pkill -9 plasmashell` or `plasmashell
--replace`.
This only occurs under X11, and due to some test automation software I use
being broken under Wayland due to Wayland security design, I can only use X11.
Also tested with latest KDE backports for Kubuntu Plucky. (plasmashell 6.3.5,
tested June 8 2025 at 2:59AM PST)
STEPS TO REPRODUCE
1. Log in with user account under X11.
2. Switch to another KVM input.
3. Switch back to original input.
OBSERVED RESULT
Area where taskbar and taskbar widgets used to exist is entirely black.
Taskbar eventually disappears entirely and maximized windows shift to fill
space.
EXPECTED RESULT
Taskbar and all taskbar widgets display normally.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: ???
KDE Plasma Version: 6.3.4
KDE Frameworks Version: 6.12.0
Qt Version: 6.8.3
ADDITIONAL INFORMATION
* I have deliberately disabled audio-related kernel modules on the machine in
question, thus the warning related to `auto_null.monitor` is expected
behaviour.
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