Hello Aurélien,
the following is 100% reproducible:

(1. Boot machine )
2. Log into Console 7 (it only happens with 7)
3. Log out again

→ Sddm is gone

For all other consoles it works (I tried 2…6 and 8…12).

Can you try this as well?

Am Sun, Jun 23, 2024 at 09:39:40AM +0200 schrieb Aurélien COUDERC:
> Le 23 juin 2024 09:28:41 GMT+02:00, Helge Kreutzmann <deb...@helgefjell.de> a 
> écrit :
> >Hello Sddm maintainers,
> >I analysed this annyoing bug further. The following pattern seems to
> >hold always:
> 
> can you see anything in the kernel or system logs (dmesg or journalctl) ?

2024-08-07T17:24:58.765735+02:00 twentytwo sddm[1522]: Signal received: SIGTERM
2024-08-07T17:24:58.765803+02:00 twentytwo systemd[1]: Stopping sddm.service - 
Simple Desktop Display Manager...
2024-08-07T17:24:58.766008+02:00 twentytwo sddm-helper[3452]: Signal received: 
SIGTERM
2024-08-07T17:24:58.766946+02:00 twentytwo sddm-helper[3452]: [PAM] Closing 
session
2024-08-07T17:24:58.770046+02:00 twentytwo sddm-helper[3452]: [PAM] Ended.
2024-08-07T17:24:58.771092+02:00 twentytwo sddm[1522]: Auth: sddm-helper exited 
with 255
2024-08-07T17:24:58.771147+02:00 twentytwo sddm[1522]: Socket server stopping...
2024-08-07T17:24:58.771187+02:00 twentytwo sddm[1522]: Socket server stopped.
2024-08-07T17:24:58.771218+02:00 twentytwo sddm[1522]: Display server 
stopping...
2024-08-07T17:24:58.825643+02:00 twentytwo sddm[1522]: Display server stopped.
2024-08-07T17:24:58.825738+02:00 twentytwo sddm[1522]: Running display stop 
script  ("/usr/share/sddm/scripts/Xstop")
2024-08-07T17:24:58.828508+02:00 twentytwo systemd[1]: sddm.service: 
Deactivated successfully.
2024-08-07T17:24:58.828736+02:00 twentytwo systemd[1]: Stopped sddm.service - 
Simple Desktop Display Manager.
2024-08-07T17:24:58.828895+02:00 twentytwo systemd[1]: sddm.service: Consumed 
578ms CPU time, 160.9M memory peak.

Or 2nd try just afterwards (with some more context):
2024-08-07T17:25:21.985606+02:00 twentytwo systemd[1]: getty@tty7.service: 
Deactivated successfully.
2024-08-07T17:25:22.018143+02:00 twentytwo systemd[1]: 
run-credentials-getty\x40tty7.service.mount: Deactivated successfully.
2024-08-07T17:25:22.019192+02:00 twentytwo systemd[1]: getty@tty7.service: 
Scheduled restart job, restart counter is at 1.
2024-08-07T17:25:22.020508+02:00 twentytwo sddm[3717]: Signal received: SIGTERM
2024-08-07T17:25:22.020553+02:00 twentytwo systemd[1]: Stopping sddm.service - 
Simple Desktop Display Manager...
2024-08-07T17:25:22.020781+02:00 twentytwo sddm-helper[3826]: Signal received: 
SIGTERM
2024-08-07T17:25:22.021592+02:00 twentytwo sddm-helper[3826]: [PAM] Closing 
session
2024-08-07T17:25:22.023305+02:00 twentytwo sddm-helper[3826]: [PAM] Ended.
2024-08-07T17:25:22.025129+02:00 twentytwo sddm[3717]: Auth: sddm-helper exited 
with 255
2024-08-07T17:25:22.025175+02:00 twentytwo sddm[3717]: Socket server stopping...
2024-08-07T17:25:22.025212+02:00 twentytwo sddm[3717]: Socket server stopped.
2024-08-07T17:25:22.025241+02:00 twentytwo sddm[3717]: Display server 
stopping...
2024-08-07T17:25:22.080872+02:00 twentytwo sddm[3717]: Display server stopped.
2024-08-07T17:25:22.080989+02:00 twentytwo sddm[3717]: Running display stop 
script  ("/usr/share/sddm/scripts/Xstop")
2024-08-07T17:25:22.083619+02:00 twentytwo systemd[1]: sddm.service: 
Deactivated successfully.
2024-08-07T17:25:22.083858+02:00 twentytwo systemd[1]: Stopped sddm.service - 
Simple Desktop Display Manager.
2024-08-07T17:25:22.085111+02:00 twentytwo systemd[1]: Started 
getty@tty7.service - Getty on tty7.
2024-08-07T17:25:25.325658+02:00 twentytwo systemd[1]: Stopping 
getty@tty7.service - Getty on tty7...
2024-08-07T17:25:25.325953+02:00 twentytwo systemd[1]: getty@tty7.service: 
Deactivated successfully.
2024-08-07T17:25:25.326075+02:00 twentytwo systemd[1]: Stopped 
getty@tty7.service - Getty on tty7.
2024-08-07T17:25:25.328211+02:00 twentytwo systemd[1]: 
run-credentials-getty\x40tty7.service.mount: Deactivated successfully.

> Without logs it will be difficult to understand what is going on. But at 
> first sight I would lean towards a graphics driver bug more than an SDDM bug.

I really don't think so.

> Maybe testing with different display managers (gdm, lightdm) could also help 
> narrowing down the issue ?

Yes, I still need to do this.

Greetings

         Helge
-- 
      Dr. Helge Kreutzmann                     deb...@helgefjell.de
           Dipl.-Phys.                   http://www.helgefjell.de/debian.php
        64bit GNU powered                     gpg signed mail preferred
           Help keep free software "libre": http://www.ffii.de/

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