https://bugs.kde.org/show_bug.cgi?id=494262
Bug ID: 494262
Summary: Main monitor is black with cursor and windows visible
after unlocking
Classification: Plasma
Product: kwin
Version: 6.1.5
Platform: Other
OS: Linux
Status: REPORTED
Severity: major
Priority: NOR
Component: core
Assignee: kwin-bugs-n...@kde.org
Reporter: kde.h2...@simplelogin.com
Target Milestone: ---
SUMMARY
I've recently been experiencing an issue where KDE Plasma will unlock into my
main monitor being a black screen while still being able to drag windows into
it and my cursor being visible. My panels will have shifted to another monitor
which still has its wallpaper visible.
I managed to consistently reproduce this issue by starting a fresh Plasma login
session by logging out and logging back in or rebooting. Then locking the
screen and waiting for my main monitor to enter standby mode after 20 seconds -
this is how I have it configured in the Power Management settings. I then wake
it up and login in on the lock screen.
**NOTE**: This issue does not appear if I wake up my main monitor BEFORE it
enters standby mode.
I observe the following log messages that are unique to the issue:
```
Oct 08 07:15:59 bazzite kwin_wayland[12512]: kwin_core:
KWin::LayerShellV1Window doesn't support setting maximized state
Oct 08 07:15:59 bazzite kwin_wayland[12512]: kwin_core:
KWin::LayerShellV1Window doesn't support setting fullscreen state
Oct 08 07:15:59 bazzite kwin_wayland[12512]: kwin_core:
KWin::LayerShellV1Window doesn't support setting maximized state
Oct 08 07:15:59 bazzite kwin_wayland[12512]: kwin_core:
KWin::LayerShellV1Window doesn't support setting fullscreen state
```
These messages do not appear if I wake up my monitor before it enters stand-by
mode so I suspect they must be related to the issue.
STEPS TO REPRODUCE
1. Enter a fresh Plasma Wayland session
2. Lock your screen
3. Wait for your monitors to enter stand-by mode (low power consumption)
4. Wake up your monitors
5. Log in
OBSERVED RESULT
A black background on the main monitor with cursor and windows visible if moved
into it. Panels moved to another monitor.
EXPECTED RESULT
My wallpaper and panels to be visible on the main monitor.
SOFTWARE/OS VERSIONS
Operating System: Bazzite 40
KDE Plasma Version: 6.1.5
KDE Frameworks Version: 6.6.0
Qt Version: 6.7.2
Kernel Version: 6.9.12-205.fsync.fc40.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 24 × AMD Ryzen 9 5900X 12-Core Processor
Memory: 62.7 GiB of RAM
Graphics Processor: NVIDIA GeForce RTX 3060 Ti/PCIe/SSE2
ADDITIONAL INFORMATION
I am aware of https://bugs.kde.org/show_bug.cgi?id=489180 however, I do not
seem to get any log messages relating to
QtWaylandClient::QWaylandWindow::waylandScreen. Also, Plasma doesn't seem to
crash, or if it does, it seems to recover.
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