Bug 511049 - Blank screen if screenlock activated while fullscreen video is paused from browser
Summary: Blank screen if screenlock activated while fullscreen video is paused from br...
Status: RESOLVED FIXED
Alias: None
Product: kwin
Classification: Plasma
Component: effects-various (other bugs)
Version First Reported In: 6.5.0
Platform: Neon Linux
: NOR normal
Target Milestone: ---
Assignee: KWin default assignee
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2025-10-24 20:52 UTC by Dm
Modified: 2025-11-26 22:40 UTC (History)
1 user (show)

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Description Dm 2025-10-24 20:52:54 UTC 
SUMMARY
Blank screen if screenlock activated while fullscreen video is paused from browser

STEPS TO REPRODUCE
1. Open any video in browser toggle fullscreen
2. wait screenlocker
3. unlock screen
4. see a desktop wallpaper and panel but control still belongs to a fullscreen video

5. If esc pressed, you can control taskbar and switch to another workspace
6. if you select another window (not browser) and browser window again, the problem disappears until you repeat srom step 1


SOFTWARE/OS VERSIONS
Operating System: KDE neon User Edition
KDE Plasma Version: 6.5.0
KDE Frameworks Version: 6.19.0
Qt Version: 6.9.2
Kernel Version: 6.14.0-33-generic (64-bit)
Graphics Platform: Wayland
Processors: 12 × Intel® Core™ i7-8750H CPU @ 2.20GHz
Memory: 16 ГиБ of RAM (15.3 ГиБ usable)
Graphics Processor: Intel® UHD Graphics 630
Manufacturer: Dell Inc.
Product Name: XPS 15 9570

ADDITIONAL INFORMATION
Comment 1 Nate Graham 2025-10-25 16:06:01 UTC 
Can't reproduce.

Does the issue reproduce for you in a new clean user account on the same computer?
Comment 2 Dm 2025-10-26 20:46:03 UTC 
(In reply to Nate Graham from comment #1)
> Can't reproduce.
> 
> Does the issue reproduce for you in a new clean user account on the same
> computer?

Also could not reproduce in a new account but still remains in old

May be I need delete any cache directory/file or config to fix that? (Plz write if anyone knows, idk how to fix(( )
Comment 3 Dm 2025-10-27 17:46:33 UTC 
(In reply to Nate Graham from comment #1)
> Can't reproduce.
> 
> Does the issue reproduce for you in a new clean user account on the same
> computer?

Found out that issue may be reproduced if "sliding windows" effect is active
Comment 4 Nate Graham 2025-10-27 18:18:22 UTC 
In English, is it called "Slide back? you can see with `LANGUAGE=C systemsettings kcm_kwin_effects` in a terminal window.
Comment 5 Bug Janitor Service 2025-11-11 03:48:05 UTC 
🐛🧹 ⚠️ This bug has been in NEEDSINFO status with no change for at least 15 days. Please provide the requested information, then set the bug status to REPORTED. If there is no change for at least 30 days, it will be automatically closed as RESOLVED WORKSFORME.

For more information about our bug triaging procedures, please read https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging.

Thank you for helping us make KDE software even better for everyone!
Comment 6 Dm 2025-11-12 04:14:14 UTC 
(In reply to Nate Graham from comment #4)
> In English, is it called "Slide back? you can see with `LANGUAGE=C
> systemsettings kcm_kwin_effects` in a terminal window.

Yes, the "slide back" effect causes the problem
Comment 7 Dm 2025-11-26 22:40:09 UTC 
No more problem in KDE 6.5.3, KF 6.20.0, QT 6.10.0, KDE Neon