Bug 461967

Summary:	Black screen with cursor after suspend, unable to login
Product:	[I don't know] kde	Reporter:	Daniel <daniel-other+kdebug>
Component:	general	Assignee:	Unassigned bugs <unassigned-bugs-null>
Status:	RESOLVED NOT A BUG
Severity:	normal
Priority:	NOR
Version First Reported In:	unspecified
Target Milestone:	---
Platform:	Arch Linux
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description Daniel 2022-11-17 22:23:35 UTC

SUMMARY
Sometimes, after a suspend the lockscreen is not there, just a black screen with a working cursor is displayed. Login is not possible, as no text field or buttons are displayed. Unlocking via "loginctl unlock-sessions" is also not possible. (So **NOT A DUPLICATE** of #457284)

This actually happens to me on two different machines. I'm pretty sure that it started with Plasma 5.26.3

STEPS TO REPRODUCE
1. suspend the laptop

OBSERVED RESULT
A black screen is displayed, with a movable cursor.

EXPECTED RESULT
The normal lockscreen should be displayed, login should be possible.

Operating System: Arch Linux
KDE Plasma Version: 5.26.3
KDE Frameworks Version: 5.99.0
Qt Version: 5.15.7
Kernel Version: 6.0.8-arch1-1 (64-bit)
Graphics Platform: X11
Processors: 8 × Intel® Core™ i7-8565U CPU @ 1.80GHz
Memory: 15,4 GiB of RAM
Graphics Processor: Mesa Intel® UHD Graphics 620
Manufacturer: LENOVO
Product Name: 20QGS00A00
System Version: ThinkPad X1 Yoga 4th

Comment 1 Daniel 2022-11-19 16:43:01 UTC

Some more details: Restarting via "plasmashell --replace" is not possible, and restarting the display/login manager (sddm) also brings no success. plasmashell seems to be a defunct process when this happens, so I am not sure if its a kwin bug or sddm or …

Comment 2 Daniel 2022-11-29 14:56:44 UTC

It seems to be a bug in the linux Kernel as it does not happen with the LTS kernel, so I'll close it.