Bug 497193

Summary:	Desktop unusable after turning off monitor when using other WM
Product:	[Plasma] plasmashell	Reporter:	hiphish
Component:	general	Assignee:	Plasma Bugs List <plasma-bugs-null>
Status:	RESOLVED NOT A BUG
Severity:	normal	CC:	kde
Priority:	NOR
Version First Reported In:	6.2.0
Target Milestone:	1.0
Platform:	Other
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description hiphish 2024-12-08 09:33:36 UTC

I am using Plasma with BSPWM as my window manager and recently I bought a 32" 4k monitor. When I turn off the monitor and turn it back on (via the power button on the monitor) the entire desktop is messed up.

STEPS TO REPRODUCE
1. Connect a 4k or WQHD monitor (via HDMI in my case)
2. Use a window manager other than KWin (BSPWM in my case)
3. Boot up the OS as usual
4. Press the power button on the monitor to turn it off
5. Press the power button again to turn it back on

OBSERVED RESULT
All my windows are gone, the pager does not work, I can open new windows from the icons-only task manager, but my keyboard does not produce any output, the menu widgets do not work. In short, it is unusable and I have no choice other than to press the power button of my tower to reboot the entire OS.

This affects only the UI as far as I can tell. I was recording some audio to a file and the recording kept going even while Plasma was messed up.

EXPECTED RESULT
The desktop should be in the same state I left it in.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Void Linux (Kernel 6.6.63_1 (64-bit))
KDE Plasma Version: 6.2.0
KDE Frameworks Version: 6.8.0
Qt Version: 6.7.2
Monitor: Dell S3221QSA
Global scaling set to 150% (although I remember this happening at 100% as well)
Window manager: 0.9.10

ADDITIONAL INFORMATION
- Entering and leaving sleep mode works fine, this is only about turning off the monitor
- Switching the monitor to a different input source and back has the same result, so it's not about the monitor losing power
- It used to work fine with my old full HD monitor, so this might be related to the higher resolution
- Does not happen with Plasma 5 on Ubuntu 24.04 (that's what I use for work)
- Does not happen with KWin on X11 or Wayland

Comment 1 Bug Janitor Service 2024-12-08 10:33:36 UTC

Thank you for the bug report!

However Plasma 6.1.90 is no longer eligible for support or maintenance from KDE; supported versions are 5.27. (LTS), and 6.2 (non-LTS) or newer. Please upgrade to a supported version as soon as your distribution makes it available to you. Plasma is a fast-moving project, and bugs in one version are often fixed in the next one.

If you need support for Plasma 6.1.90, please contact your distribution, who bears the responsibility of providing support for older releases that are no longer supported by KDE.

If you can reproduce the issue after upgrading to a supported version, feel free to re-open this bug report.

Comment 2 hiphish 2024-12-08 12:41:16 UTC

I accidentally set the version of the ticket to 6.1.90, but the version I'm running is actually 6.2.0

Comment 3 David Edmundson 2025-01-27 14:09:29 UTC

>- Does not happen with KWin on X11 or Wayland

Then it doesn't look like a Plasma bug until proven otherwise.

Comment 4 hiphish 2025-01-27 17:36:06 UTC

> Then it doesn't look like a Plasma bug until proven otherwise.

The same setup with the same window manager used to work on Plasma 5.