SDDM starts a new session for an already logged in user

[City-busz]

Steps to reproduce:

1. SDDM starts at system startup. Log in as usual.
2. Switch user with dm-tool switch-to-greeter.
3. Try to log in with the same user.
   The expected result is to get back the already opened session. Instead of that, a new user session is started for the same user causing various problems. In the same case, GDM, LightDM and LXDM switch back to the already opened session properly.

[jleclanche]

On top of this we need visual feedback somehow that the session is open.

[xiangzhai]

logout and login several times, then loginctl show as below:

loginctl 
   SESSION        UID USER             SEAT            
       c27        989 sddm             seat0           
         3       1000 zhaixiang        seat0           
         2       1000 zhaixiang        seat0           

3 sessions listed.

it is often N sessions listed depend on the relogin times.

[cyberesprit]

There is no continuation at this bug? This problem still exists today ...

[jleclanche]

PRs welcome if you wish to work on it.

[tpgxyz]

On daily use this is quite annoying, and each logout existing session is not shut down, which leads to have many processes that lives over not used sessions.

[plfiorini]

i don't have time to do it, @davidedmundson do you have time to help out?

[cyberesprit]

Sorry, but this problem still exists today :-(

[mx1up]

see PR #730

[Anagastes]

This issue still exist in version 0.19.0-4 on arch.

I have already set this config, unfortunately without success.
ReuseSession=true

As soon as I lock the pc, change the user and then log back into the 1st user, a new session is started instead of using the old one.

[mx1up]

when this feature finally came available in my distro, I also encountered some problems with it, but it has been a while.. I thought I did something wrong. I will try it out over the weekend

[LaserHydra]

I am using SDDM 0.19.0-7 on Artix, and I can confirm I am still experiencing the same issue, despite having ReuseSession=true

I'll gladly provide more information if I can, though I am not certain which other information may be useful in this case.

[UMU618]

Can't reproduce on Debian 11, sddm 0.19.0-3.

[enkeyz]

Same problem with latest Manjaro, sddm 0.19.0-8, ReuseSession=true

1. Switch user
2. Log back into the same account with SDDM
3. Black screen with cursor

[City-busz]

I confirm that the original issue that I reported was fixed (probably by #730 and #1216 ). I tested it with sddm 0.19.0. I still experience issues with wayland sessions (switching to wrong VT), but it's another issue.