https://bugs.kde.org/show_bug.cgi?id=460440
Bug ID: 460440
Summary: Black background and missing context menu on the
desktop in multiscreen configuration
Classification: Plasma
Product: plasmashell
Version: 5.25.5
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: plasma-b...@kde.org
Reporter: carlon.l...@gmail.com
CC: k...@davidedmundson.co.uk
Target Milestone: 1.0
SUMMARY
In some occasions, in a multiscreen configuration, one of the two screens may
turn up to have a black background and to show no context menu on the desktop.
Sometimes switching setup in the settings fixes the problem and the desktop is
back to normal. Sometimes this does not work and unplugging and plugging the
screen fixes the situation. Sometimes restarting plasmashell with "plasmashell
--replace" fixes the situation.
STEPS TO REPRODUCE
Unfortunately this does not happen deterministically, but it is not infrequent.
May happen immediately after the boot.
OBSERVED RESULT
One of the screens is working as usual, the other one has a black background
and no context menu can be opened. If this happens on the primary screen, the
panel is visible and seems to work as usual. Windows can be moved on the black
background.
EXPECTED RESULT
Background should be present and context menu should open with the usual mouse
button.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 5.19.13
KDE Plasma Version: 5.25.5 Wayland
KDE Frameworks Version: 5.98.0
Qt Version: 5.15.6
ADDITIONAL INFORMATION
On the same machine I used to connect a HDMI 1080p screen and I do not remember
this problem. This situation began after I bought a 4K USB-C screen. If the
screen itself (or the 4K resolution) is really the cause of the issue is
unknown. The failing setup is with two 4K screens, one with scaling factor 2
and the other with scaling factor 1.5.
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