https://bugs.kde.org/show_bug.cgi?id=502894
Bug ID: 502894
Summary: Resuming from sleep results in unresponsive black
screen if external screen disconnected
Classification: Plasma
Product: KScreen
Version: 6.3.4
Platform: openSUSE
OS: Linux
Status: REPORTED
Severity: critical
Priority: NOR
Component: common
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
SUMMARY
If I send the laptop to sleep while connected to a USB-C dock with an external
monitor and after sleep reached I disconnect it from the dock, resuming will
result in an unresponsive state; i.e. black screen, no reaction to anything and
in some cases also kernel panic happens (Caps Lock is blinking), e.g. when I
reconnect the dock.
STEPS TO REPRODUCE
1. Connect the laptop to a USB-C dock with an external monitor, set it to
external monitor only.
2. Send the laptop to sleep
3. Disconnect from the dock
4. Wake up the laptop
OBSERVED RESULT
Unresponsive state with black screen, no reaction to anything. Reconnecting to
dock does not solve, moreover sometime leads to kernel panic.
EXPECTED RESULT
Wake up normally
SOFTWARE/OS VERSIONS
Operating System: openSUSE Tumbleweed 20250414
KDE Plasma Version: 6.3.4
KDE Frameworks Version: 6.13.0
Qt Version: 6.9.0
Kernel Version: 6.14.1-1-default (64-bit)
Graphics Platform: X11 or Wayland
ADDITIONAL INFORMATION
I experience this since 6.3.4, before it was working fine. I have the feeling
that somehow it is connected to the fix of bug 499383.
In the journal I see the following:
kwin_wayland[2333]: kwin_wayland_drm: failed to open drm device at ""
kwin_wayland_wrapper[2417]: Key repeat discarded, Wayland compositor doesn't
seem to be processing events fast enough!
and lines with
qt.qpa.wayland: There are no outputs - creating placeholder screen
Also there is:
plasmashell[2584]:
file:///usr/share/plasma/plasmoids/org.kde.desktopcontainment/contents/ui/FolderItemDelegate.qml:233:17:
Unable to assign [undefined] to bool
plasmashell[2584]: kf.plasma.quick: Exposed with no visual parent. Window
positioning broken.
plasmashell[2584]: kf.plasma.quick: Exposed with no visual parent. Window
positioning broken.
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