Bug 507321

Summary:	[Privacy risk] Screen locker: Application content is visible for ~400 ms after returning from Sleep
Product:	[Plasma] plasmashell	Reporter:	Alexander Potashev <aspotashev>
Component:	general	Assignee:	Plasma Bugs List <plasma-bugs-null>
Status:	RESOLVED DOWNSTREAM
Severity:	normal	CC:	kde
Priority:	NOR
Version First Reported In:	6.3.5
Target Milestone:	1.0
Platform:	Other
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description Alexander Potashev 2025-07-21 17:41:36 UTC

SUMMARY
Screen locker: Application content is visible for ~400 ms after returning from Sleep.

STEPS TO REPRODUCE
1. Power Management settings: "When laptop lid closed: Sleep"
2. Screen Locking settings: "Lock after waking from sleep" in enabled.
3. Open some apps on a laptop.
4. Close laptop lid. Wait a few seconds for laptop to go to Sleep.
5. Open laptop lid.


OBSERVED RESULT
Application(s) and all their window content is visible for ~400 ms. After that, the screen locker UI appears on screen.

This is a privacy and security risk: an unauthorized person may get access to sentitive data, including credentials/passwords if they were on screen before closing laptop lid.

EXPECTED RESULT
Screen locker UI (or at least a black screen) should appear immediately after returning from Sleep.

SOFTWARE/OS VERSIONS
Operating System: Debian GNU/Linux rodete 
KDE Plasma Version: 6.3.5
KDE Frameworks Version: 6.13.0
Qt Version: 6.8.2
Kernel Version: 6.12.27-1rodete1-amd64 (64-bit)
Graphics Platform: X11
Processors: 14 × Intel® Core™ Ultra 7 165U
Memory: 62.3 GiB of RAM
Graphics Processor: Intel® Graphics

ADDITIONAL INFORMATION

Comment 1 David Edmundson 2025-07-22 13:42:04 UTC

>Graphics Platform: X11

This is known and not fixable. There are issues below us in the stack. It's one of the we're moving to wayland.

There's a dupe somewhere with more details, I've seen your name on bugzilla enough to know you'll be able to find it.