Bug 487495

Summary: kwin on X11 shows a black lock screen with cursor after display goes in standby/sleep mode
Product: [Plasma] kwin Reporter: Jim Jones <rauchwolke>
Component: generalAssignee: KWin default assignee <kwin-bugs-null>
Status: RESOLVED DUPLICATE    
Severity: normal CC: rpbikker, xaver.hugl
Priority: NOR    
Version: 6.0.5   
Target Milestone: ---   
Platform: Other   
OS: Other   
Latest Commit: Version Fixed In:
Sentry Crash Report:

Description Jim Jones 2024-05-24 18:48:18 UTC 
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SUMMARY
the screen stays black and just shows a cursor when the screen is locked and the screen gets woken up from sleep

STEPS TO REPRODUCE
1. sleep 1 ; xset dpms force standby
2. press meta + L (to look the screen)
3. wait until the screen goes in standby/sleep mode
4. mouse the mouse cursor

OBSERVED RESULT
the screen stays black and just shows the mouse cursor (although the lockscreen is still there as the mouse cursor changes over the position of the password field)
switching to a virtual terminal (ctrl+alt+f1) and back to the X11 session brings back the lock screen

EXPECTED RESULT
the lock screen gets shown

SOFTWARE/OS VERSIONS
Operating System: Gentoo Linux 2.15
KDE Plasma Version: 6.0.5
KDE Frameworks Version: 6.2.0
Qt Version: 6.7.0
Kernel Version: 6.9.1 (64-bit)
Graphics Platform: X11
Memory: 38.8 GiB of RAM
Graphics Processor: Mesa Intel® UHD Graphics 620

ADDITIONAL INFORMATION
Comment 1 Reinier 2024-05-26 17:51:22 UTC 
I'm seeing this too.


Operating System: Fedora Linux 40
KDE Plasma Version: 6.0.4
KDE Frameworks Version: 6.2.0
Qt Version: 6.7.0
Kernel Version: 6.8.9-300.fc40.x86_64 (64-bit)
Graphics Platform: X11
Graphics Processor: Mesa Intel® HD Graphics 620
Comment 2 Reinier 2024-05-26 18:06:33 UTC 
And, _not_ seeing it on my workstation.

Same software versions, but graphics processor is AMD Radeon RX 580.
Comment 3 Zamundaaa 2024-05-29 12:04:12 UTC 

*** This bug has been marked as a duplicate of bug 476567 ***
Comment 4 Reinier 2024-05-29 16:34:18 UTC 
That's not the same bug! 

There's no grace period set here and the symptom is not a frozen screen. Unlocking still works, even when the unlock screen is not shown.
Comment 5 Jim Jones 2024-05-29 22:28:18 UTC 
> That's not the same bug!

True, this is another bug!
Comment 6 Reinier 2024-06-15 19:26:13 UTC 

*** This bug has been marked as a duplicate of bug 483163 ***