Bug 514513

Summary:	Locking the computer while a window is fullscreen makes it invisible after unlocking
Product:	[Plasma] kwin	Reporter:	Tech-Tac <im.tech.tac>
Component:	effects-various	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	REPORTED ---
Severity:	normal	CC:	xaver.hugl
Priority:	NOR
Version First Reported In:	6.5.4
Target Milestone:	---
Platform:	Other
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description Tech-Tac 2026-01-12 22:05:18 UTC

STEPS TO REPRODUCE
1. Open, e.g., Konsole and press F11 (works with Firefox also)
2. Lock screen (keyboard shortcut or wait for the time out defined in power settings)
3. Unlock

OBSERVED RESULT
Konsole window is not visible but is still fullscreen and intractable, other windows that were open in the background show on screen instead although Konsole is blocking clicks.

This doesn't go off until you switch to another window (i.e. alt+tab), interestingly not if you press F11 again, and also not when switching virtual desktops.

EXPECTED RESULT
Appear just like it did before locking.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Arch
KDE Plasma Version: 6.5.4
KDE Frameworks Version: 6.21.0
Qt Version: 6.10.1
Compositor: Wayland

Comment 1 Zamundaaa 2026-01-12 22:18:40 UTC

I can't reproduce that here, it works just as expected. Do you have any non-default kwin effects installed?
If you open the debug console (search for "kwin debug console" in krunner), is there anything weird about the invisible window, like its geometry, or opacity value?

Comment 2 Tech-Tac 2026-01-14 14:36:18 UTC

I think it's the Slide Back animation effect, disabling it makes things behave as expected.

Comment 3 Zamundaaa 2026-01-14 16:56:41 UTC

hmm, I'm not super surprised there's another weird bug in it, but making a window invisible is a new one.