https://bugs.kde.org/show_bug.cgi?id=450542
Bug ID: 450542
Summary: Black screen after unplugging external monitors when
laptop screen is disabled
Product: kscreenlocker
Version: 5.24.1
Platform: Kubuntu Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: greeter
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Target Milestone: ---
SUMMARY
Removing the external displays (via thunderbolt dock) while the screenlocker is
active results in a black screen on the laptop
STEPS TO REPRODUCE
1. Attach laptop to dock and use external monitors ONLY (laptop screen
disabled)
2. Lock screen (e.g. with super key+L)
3. Detach usb c dock cable
OBSERVED RESULT
Screen is black except for mouse cursor, cannot access desktop or screenlocker
EXPECTED RESULT
Expect to see the screenlocker password prompt with wallpaper background
SOFTWARE/OS VERSIONS
Linux/KDE Plasma:
(available in About System)
KDE Plasma Version: 5.24.1
KDE Frameworks Version: 5.91.0
Qt Version: 5.15.2
Graphics platform: X11 , Intel TigerLake-LP GT2 [Iris Xe Graphics]
Distro: kubuntu 21.10 with backports PPA
ADDITIONAL INFORMATION
Other bugs seem to relate to compositing, and are fixable by switching
ctrl-alt-f2 and back again to ctrl-alt-f1. However, this is not the same bug.
My current workaround is : hit ctrl-alt-f2 and type "ps -ef | grep
kscreenlocker_greet" then kill the PID of the process.
Hit ctrl-alt-f1 and the screenlocker password prompt appears as expected.
I can reproduce this at will.
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