https://bugs.kde.org/show_bug.cgi?id=451386
Bug ID: 451386
Summary: Black Screen with Movable Cursor after Screens Resume
from Sleep
Product: kwin
Version: 5.24.2
Platform: Debian testing
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: stephenackerma...@gmail.com
Target Milestone: ---
SUMMARY
When my screens go into standby, it is not possible to wake back up to the
login screen. Only a black screen with a cursor is present, in some cases there
are duplicate images of the cursor (only one moves).
***
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***
STEPS TO REPRODUCE
1. Wait for the screen to time-out and power off
2. Move the mouse to wake the screen
OBSERVED RESULT
Black screen with movable cursor. Unable to interact with the login screen or
resume the session.
EXPECTED RESULT
See Lock screen, can log in successfully and resume the prior session.
SOFTWARE/OS VERSIONS
KDE Plasma 5.24.2
KDE Frameworks 5.90.0
Qt Version 5.15.2
Kernel Version 5.16.12
Graphics Platform: Wayland
Processor: Ryzen 9 3900X
GPU: RX 6700XT
ADDITIONAL INFORMATION
The Displays are reported in display settings as LG Electronics LG Ultra HD
214473 and LG Electronics LG Ultra HD 183701. They were both scaled to 125%.
I have a very similar issue on X11, where when the screens first wake, they
will be blank. After a few moments (and sometimes some flickering) eventually
at least one screen will get a locked login page, and I can log in. Often when
typing into this login page, it doesn't actually show any characters typing,
but it will unlock the screen, at which point normal operation resumes.
I attempted to loginctl unlock-session, it didn't fix the problem. I tried to
kill kscreenlocker, and did get the "The screen locker has crashed, run this
command to unlock" page, but after running the provided loginctl
unlock-session, there was still just a black screen with a cursor.
I attempted to restart SDDM, but it did not seem to result in a usable system.
I had to fully reboot.
These screens seem to disconnect to some extent when they go into standby,
which I believe is related to the problem. If I move the mouse immediately
after the screens go into standby (they display a message for a few seconds)
then everything is fine. Once they go into sleep, though, the bug happens.
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