https://bugs.kde.org/show_bug.cgi?id=462316
Bug ID: 462316
Summary: Black background after monitors were in standby
Classification: Plasma
Product: plasmashell
Version: 5.24.7
Platform: Kubuntu
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Desktop Containment
Assignee: plasma-b...@kde.org
Reporter: geloczig...@gmail.com
CC: notm...@gmail.com
Target Milestone: 1.0
Created attachment 154084
--> https://bugs.kde.org/attachment.cgi?id=154084&action=edit
Screenshot with latest KDE Neon
SUMMARY
By default the monitors turn off after 10 minutes of inactivity. Then if you
move the mouse they turn back on again. After this my primary desktop turns to
black and you can't right click (menu does not appear).
This command restart the shell so I can continue my work:
kquitapp5 plasmashell || killall plasmashell && kstart5 plasmashell
STEPS TO REPRODUCE
1. Boot Kubuntu 22.04 or latest KDE Neon or Fedora 37 KDE Plasma Desktop from
USB stick or install it
2. Turn off monitors with "sleep 1 && xset -display :0.0 dpms force off"
3. WAIT until the monitors enter standby mode (backlight goes off)
4. After your monitors turned off, move your mouse.
5. One of the desktops will have a black background and right-click menu does
not appear.
OBSERVED RESULT
One of the desktops will have a black background and right-click menu does not
appear.
Repeating the test may produce two black desktops.
EXPECTED RESULT
Desktop functions without glitches.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma:
(available in About System)
KDE Plasma Version: reproduced with 5.24.6, 5.24.7, and 5.26.3
KDE Frameworks Version: 5.92.0
Qt Version: 5.15.3
ADDITIONAL INFORMATION
I use two identical EIZO EV2750 60Hz 2560x1440 monitors on DisplayPort-0 and
DisplayPort-1 in dual monitor mode (horizontally extended). Primary monitor is
in center, second monitor is on my right.
Observed workaround: Plugging my second monitor to HDMI instead of
DisplayPort-1 makes this bug disappear.
- This bug does happen with my AMD RX 6600 XT, but not with my older AMD RX 580
8GB.
- Reproduced with latest Kubuntu LTS (22.04.1)
- Reproduced with latest KDE Neon (neon-user-20221117-0714.iso)
- Reproduced with Fedora 37 KDE edition (Fedora-KDE-Live-x86_64-37-1.7.iso),
interesting it uses Wayland instead X11 and the same bug happens.
- Does not happen with Kubuntu 20.04.5, plasmashell 5.18.8 works fine.
As you see I could reproduce this bug just by booting from a USB stick, so I
used always the default settings, did not change anything.
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