Bug 498709

Summary:	kscreenlocker_greet will not allow me to log in after locking the screen for a while
Product:	[Plasma] plasmashell	Reporter:	Earl Ruby <me>
Component:	Screen locking	Assignee:	Plasma Bugs List <plasma-bugs-null>
Status:	RESOLVED UNMAINTAINED
Severity:	grave	CC:	nate
Priority:	NOR
Version First Reported In:	5.27.11
Target Milestone:	1.0
Platform:	Kubuntu
OS:	Linux
Latest Commit:		Version Fixed In:
Sentry Crash Report:

Description Earl Ruby 2025-01-15 21:31:50 UTC

SUMMARY
kscreenlocker_greet will not allow me to log in after locking the screen for a while.

STEPS TO REPRODUCE
On a fresh Kubuntu 24.04 system with two monitors:
1. In "System Settings > Power Management > Energy Saving > On AC Power" check that Suspend Session is set to "Lock Screen" (not Sleep).
2. Go away for a while.
3. When returning, click a key or move the mouse to activate the screen.
4. Can't login.

OBSERVED RESULT
One of two things happens:
1. The password text box does not appear at all (just the background image).
2. The password box appears but will not accept keyboard input. (Mouse pointer is active)

To recover I have to ctrl-alt-F3 to get a terminal, login, then kill -9 the kscreenlocker_greet process. After that the kglobalaccel process will start consuming 100% of CPU so I have to kill that process too.

Once I do that I can ctrl-alt-F2 to get back to the GUI lock screen, wait a few seconds, the login password box appears and I can log in.

If I leave the system alone long enough for the screen to lock the same thing happens again.

EXPECTED RESULT
I should be able to log back into the system.

SOFTWARE/OS VERSIONS
Hardware: System76 Serval WS laptop with external HDMI-connected monitor
Operating System: Kubuntu 24.04
KDE Plasma Version: 5.27.11
KDE Frameworks Version: 5.115.0
Qt Version: 5.15.13
Kernel Version: 6.9.3-76060903-generic (64-bit)
Graphics Platform: offscreen
Processors: 32 × 13th Gen Intel® Core™ i9-13900HX
Memory: 62.6 GiB of RAM
Graphics Processor: NVIDIA GeForce RTX 4070 Laptop GPU/PCIe/SSE2

ADDITIONAL INFORMATION

Comment 1 Nate Graham 2025-01-15 22:35:39 UTC

Unfortunately Plasma 5.27 is EOL and unmaintained at this point, having been first released almost two years ago. I'd recommend upgrading to Kubuntu 24.10 which will at least get you Plasma 6.15., which is over a year and a half newer. Thanks for understanding! And if after upgrading, you still encounter this exact same issue, please feel free to re-open the bug report.

Comment 2 Earl Ruby 2025-01-16 01:23:30 UTC

I've been sticking with LTS releases since 14.04 due to driver support but maybe that's no longer necessary. I'll give 24.10 a shot.

Comment 3 Bug Janitor Service 2025-01-31 03:47:32 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 4 Earl Ruby 2025-02-02 03:08:54 UTC

Updated to Kubuntu 24.10 and "Lock Screen" is no longer an option under "Suspend Session". Since you can't pick the configuration I used that caused lockups, I guess it's kind-of fixed?

$ kinfo
Operating System: Kubuntu 24.10
KDE Plasma Version: 6.1.5
KDE Frameworks Version: 6.6.0
Qt Version: 6.6.2
Kernel Version: 6.9.3-76060903-generic (64-bit)
Graphics Platform: Wayland
Processors: 32 × 13th Gen Intel® Core™ i9-13900HX
Memory: 62.6 GiB of RAM
Graphics Processor: NVIDIA GeForce RTX 4070 Laptop GPU/PCIe/SSE2

Comment 5 Nate Graham 2025-05-14 19:20:32 UTC

Heh, ok!