Bug 459240

Summary:	After unlocking screen and showing desktop, panel and windows disappear on non-primary monitors.
Product:	[Plasma] kwin	Reporter:	dans64
Component:	multi-screen	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED FIXED
Severity:	normal	CC:	nate, xaver.hugl
Priority:	NOR	Flags:	nate: Wayland- nate: X11+
Version First Reported In:	5.25.5
Target Milestone:	---
Platform:	Arch Linux
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description dans64 2022-09-16 21:37:31 UTC

SUMMARY
***
After unlocking screen when you had previously used show desktop on a multi monitor display, the panels on non-primary displays disappear for a few seconds before becoming visable.
***


STEPS TO REPRODUCE
1. Have multi-monitor setup
2. Use 'show desktop' button/hotkey to hide windows/show desktop.
3. Lock screen
4. Log back in
5. Unhide desktop with button or shortcut

OBSERVED RESULT
Watch all windows on non-primary displays disappear and you can only see your background, cursor can go over windows and panel to interact with them, even drag/move them onto your primary monitor. Eventually after a few seconds the windows and panel will re-appear.

EXPECTED RESULT
After unhiding desktop after unlocking screen panel and windows should all be visable.

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: Arch Linux
(available in About System)
KDE Plasma Version: 5.25.5
KDE Frameworks Version: 5.98
Qt Version: 5.15.6

ADDITIONAL INFORMATION
Using AMDGPU, mesa and Xorg, haven't tried Wayland yet. Have dual identical 1440p 144hz monitors connected with Displayport.

Comment 1 dans64 2022-09-18 16:15:57 UTC

updating that this does not happen on wayland, only xorg

Comment 2 dans64 2023-02-18 05:58:57 UTC

Forgot to say, but this hasn't happened since 5.26 and is fixed.