Bug 515199

Summary:	Connecting/disconnecting the HDMI cable to my 4K TV kills Plasma Login Manager
Product:	[Plasma] plasma-login-manager	Reporter:	Fernando Marcelino Muniz <fernandommuniz>
Component:	general	Assignee:	Plasma Bugs List <plasma-bugs-null>
Status:	NEEDSINFO WAITINGFORINFO
Severity:	crash	CC:	kde, kdedev, olib141
Priority:	NOR	Keywords:	multiscreen, usability
Version First Reported In:	unspecified
Target Milestone:	---
Platform:	CachyOS
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:
Attachments:	Issue in Plasma 6.5.5

Description Fernando Marcelino Muniz 2026-01-28 11:59:40 UTC

STEPS TO REPRODUCE
1. Be at the Plasma Login Manager.
2. Connect or disconnect A HDMI cable connected to a monitor/TV.

OBSERVED RESULT
"He's dead, Jim."

EXPECTED RESULT
Normal transition between monitors.

SOFTWARE/OS VERSIONS
Operating System: CachyOS Linux 
KDE Plasma Version: 6.5.5
KDE Frameworks Version: 6.22.0
Qt Version: 6.10.1
Kernel Version: 6.18.7-2-cachyos (64-bit)
Graphics Platform: Wayland
Processors: 8 × 11th Gen Intel® Core™ i5-11300H @ 3.10GHz
Memory: 9 GB of RAM (8.1 GB usable)
Graphics Processor 1: Intel® Iris® Xe Graphics
Graphics Processor 2: NVIDIA GeForce GTX 1650
Manufacturer: LENOVO
Product Name: 82MG
System Version: IdeaPad Gaming 3 15IHU6

Comment 1 TraceyC 2026-01-30 10:51:09 UTC

Thanks for the bug report. We need more detail in order to understand what's happening.
When you say "He's dead, Jim.", can you explain what's actually happening on your system? What exactly do you see when you connect or disconnect the HDMI cable?
Also, can you provide system logs for just before and just after the cable plug event?

Thanks.

Comment 2 Fernando Marcelino Muniz 2026-01-30 11:18:50 UTC

When I disconnect the screen while on PLM the system dies and I have to reboot.
When I connect the screen while on PLM the system dies and I have to reboot.
I can't provide logs just before/after because the system dies and I have to reboot.

Comment 3 Fernando Marcelino Muniz 2026-01-30 11:27:48 UTC

Created attachment 189056 [details]
Issue in Plasma 6.5.5

Comment 4 Oliver Beard 2026-02-02 14:46:04 UTC

I can't reproduce this. Journal logs capturing connection and disconnecting causing the problem would be needed to investigate further.

Comment 5 Fernando Marcelino Muniz 2026-02-02 14:47:44 UTC

How do I do this?

Comment 6 David Edmundson 2026-02-02 15:03:50 UTC

sudo -u plasmalogin systemctl --user edit plasma-login.service

It should show some existing lines and a section to add things.

If you add

```
[Service]
Environment=WAYLAND_DEBUG=1
```