https://bugs.kde.org/show_bug.cgi?id=428450
Bug ID: 428450
Summary: Plasmashell hangs/crashes sporadically after monitor
standby if vsync is enabled (amdgpu)
Product: plasmashell
Version: 5.19.5
Platform: Kubuntu Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: k...@davidedmundson.co.uk
Reporter: bruzzlee...@gmail.com
CC: plasma-b...@kde.org
Target Milestone: 1.0
SUMMARY
Plasmashell hangs/crashes sporadically after wakeup from monitor standby
(monitor power off) and needs to be restarted.
The problem could be traced back to the "vsync" options in the compositor
settings by trial and error. No log entries related to the issue could be
identified.
Setting vsync to "Never" prevents the "crash".
WORKAROUND:
Set vsync to "Never".
Enable the "TearFree" option in amdgpu configuration to prevent tearing.
STEPS TO REPRODUCE
1. Connect at least 2 monitors with a different standby and switch off
behaviour.
2. VSYNC to e.g. Automatic
3. sleep 1; xset dpms force standby
4. Wake up by keyboard or mouse after ~30 seconds
OBSERVED RESULT
Task bar and desktop (including widgets) do not appear. Wallpaper stays black.
KRunner still works.
Plasmashell restart required: kquitapp5 plasmashell && kstart5 plasmashell
EXPECTED RESULT
The same desktop environment / layout as before the standby.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Kubuntu 20.10
(available in About System)
KDE Plasma Version: 5.19.5
KDE Frameworks Version: 5.74.0
Qt Version: 5.14.2
Mesa: 20.2.1
HARDWARE:
Radeon RX 580 4GB AORUS GIGABYTE
GA-X79-UD5
i7-3930K
ADDITIONAL INFORMATION
https://forum.kde.org/viewtopic.php?f=289&t=168162&start=15
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