https://bugs.kde.org/show_bug.cgi?id=505379
Bug ID: 505379
Summary: In certain settings the screen contents remain visible
when screen locker should've already activated in a VM
Classification: Plasma
Product: plasmashell
Version First 6.3.91
Reported In:
Platform: Kubuntu
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Screen locking
Assignee: plasma-b...@kde.org
Reporter: darkinosun...@protonmail.com
Target Milestone: 1.0
Created attachment 182120
--> https://bugs.kde.org/attachment.cgi?id=182120&action=edit
Showcasing the bug in a VM recorded from the host
SUMMARY
When the lockscreen auto activation time is longer than the turn off monitor
time, the contents of the screen stay visible in a VM (KVM with virt-manager).
My guess is that plasma turns off the screen, which is not fully implemented in
a VM (dimming part works). Even though I can't reproduce in on real hardware,
I think it's worth fixing/make a work around just for VMs and for the
possibility that it could maybe happen with buggy screens.
Best fix would be to make the whole screen black before turning it off.
STEPS TO REPRODUCE
1. Have a VM with e. g. Kubuntu testing
2. Set the lockscreen timer to e. g. 2 mins
3. Set turn off screen to e. g. 1 min
4. Wait the time, and notice that you can still see the content (albeit, very
much dimmed)
OBSERVED RESULT
You can see the screen contents.
EXPECTED RESULT
You shouldn't be able to see the screen contents.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Kubuntu 25.10 (beta testing version)
KDE Plasma Version: 6.3.91
KDE Frameworks Version: 6.14.0
Qt Version: 6.8.3
Graphich Platform: Wayland
Graphich Processor: llvmpipe
ADDITIONAL INFORMATION
AFAIK, the the contents don't update, so it could be that the screen locker is
there, it's just not drawn yet.
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