Bug 392500

Summary: Session crashes when an external monitor is connected
Product: [Unmaintained] ksmserver Reporter: Marcus <biowep>
Component: generalAssignee: Lubos Lunak <l.lunak>
Status: RESOLVED FIXED    
Severity: normal    
Priority: NOR    
Version First Reported In: 5.12.4   
Target Milestone: ---   
Platform: Neon   
OS: Linux   
Latest Commit: Version Fixed In:
Sentry Crash Report:

Description Marcus 2018-03-29 19:31:59 UTC 
This bug happened starting from Plasma 5.12.3 (or maybe .2). I remember perfectly that it worked on the initial version of Plasma 5.12.

What happens: With an external monitor the screen will suddently become black and the system will go to the login screen (which is correctly visualized).

Now I use the live version of KDE Neon. When I start the system without the external monitor HDMI attached, it correctly loads. As soon as I attach the HDMI the screen becomes black and then loops between the initial white KDE logo on a black background and a total black screen.

I use the live distro KDE Neon as downloaded from the website, without any modification.

My GPU is: AMD HD 7950, CPU: Intel i5 3570k.

The problem is 100% reproducible so I can provide logs if you tell me the command to input in the terminal.
Comment 1 Martin Flöser 2018-03-29 19:53:05 UTC 
Is this on X11 or Wayland?
Comment 2 Marcus 2018-03-29 19:56:03 UTC 
It is on X11
Comment 3 Martin Flöser 2018-03-30 05:41:36 UTC 
Reassigned to ksmserver which holds the X11 session.
Comment 4 Marcus 2018-10-27 13:44:06 UTC 
I'm closing this issue as I switched back to plasma and no more shows up in newer versions.