Bug 433865

Summary:	lock screen frozen after resume from suspend when compositing is enabled
Product:	[Plasma] kwin	Reporter:	pauld <paul_deg>
Component:	compositing	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED UNMAINTAINED
Severity:	normal	CC:	bshah, nate
Priority:	NOR
Version First Reported In:	5.20.5
Target Milestone:	---
Platform:	Other
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description pauld 2021-03-02 16:07:47 UTC

SUMMARY
KDE Plasma login screen frozen after resume from suspend, keyboard typing is not reflecting on screen, buttons not responding. Yet able to type password and login.

STEPS TO REPRODUCE
1. Let system suspend.
2. Wake up system by pressing any button.


OBSERVED RESULT
Login screen is shown normally but in frozen state, typing no reflected, button not responding, yet typing passwords lets me in.

EXPECTED RESULT
Login screen should work normally, typing password should be reflected on the screen. 


SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: Fedora 33
(available in About System)
KDE Plasma Version: 5.20.4
KDE Frameworks Version: 5.79.0
Qt Version: 5.15.2

ADDITIONAL INFORMATION
Laptop  Asus UX580 (Intel + Nvidia) 4K screen, nouveau driver.

Comment 1 pauld 2021-03-20 16:52:15 UTC

As a workaround I disabled Compositor and switched to GDM from SDDM.

Comment 2 Nate Graham 2021-03-20 20:32:49 UTC

If you re-enable compositing but still use GDM, does it break again, or stay working?

Comment 3 pauld 2021-03-20 21:26:16 UTC

Enabling Compositor breaks it, even with GDM.

Comment 4 Nate Graham 2021-03-21 02:22:43 UTC

Then GDM is unrelated. It doesn't make much sense anyway because we're talking about the *lock* screen anyway, not the *login* screen (both SDDM and GDM are login managers, not screen lockers). So you can restore SDDM.

Comment 5 pauld 2021-05-12 16:46:29 UTC

Upgraded to KDE 5.21 on Fedora 34: same issue.

Comment 6 pauld 2021-05-12 16:51:20 UTC

Also, the issue appears only applicable when primary display switched to external monitor.

Comment 7 David Edmundson 2023-09-06 10:38:57 UTC

This bug was reported against an outdated version of KWin. We have made many changes since the. 
If the issue persists in newer versions can you reopen the bug report updating the version number.