Plasma + sddm

[Frédéric]

Hi,
I'm running Plasma + sddm on F31. Since a week, I try to use the
computer with multiple users and then I log off before the other user
logs in. When I log off, the screen just freezes. I can switch to a
console screen with Ctrl+Alt+F2 and kill all processes of the first
user (systemd, agent, sddm_helper) until I get the login screen again.
Very annoying.
Is there a way to make it work?
Kind regards,
F

[Sérgio Basto]

On Thu, 2020-08-20 at 19:43 +0200, Frédéric wrote:
> Hi,
> I'm running Plasma + sddm on F31. Since a week, I try to use the
> computer with multiple users and then I log off before the other user
> logs in. When I log off, the screen just freezes. I can switch to a
> console screen with Ctrl+Alt+F2 and kill all processes of the first
> user (systemd, agent, sddm_helper) until I get the login screen
> again.
> Very annoying.
> Is there a way to make it work?

I use Plasma + sddm on F31.  I don't know if I have the same use that
you have, but to restart sddm you just need

systemctl restart sddm
> Kind regards,
> F
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[Frédéric]

> I use Plasma + sddm on F31.  I don't know if I have the same use that
> you have, but to restart sddm you just need
> systemctl restart sddm

much simpler indeed as a workaround, thanks!

F

[Rex Dieter]

Frédéric wrote:
> Hi,
> I'm running Plasma + sddm on F31. Since a week, I try to use the
> computer with multiple users and then I log off before the other user
> logs in. When I log off, the screen just freezes. I can switch to a
> console screen with Ctrl+Alt+F2 and kill all processes of the first
> user (systemd, agent, sddm_helper) until I get the login screen again.
> Very annoying.
> Is there a way to make it work?

2 things to try:
* disable session management, systemsettings5->startup&shutdown->desktop 
session, On Login chose option *other* than "Restore previous session"
* enable logind feature to kill user processes on logout, edit 
/etc/systemd/logind.conf , set key
KillUserProcesses=yes

-- Rex

[Frédéric]

> 2 things to try:
> disable session management, systemsettings5->startup&shutdown->desktop
>
> session, On Login chose option *other* than "Restore previous session"

That was already set to "Start with an empty session".
> enable logind feature to kill user processes on logout, edit
>
> /etc/systemd/logind.conf , set key
> KillUserProcesses=yes

This did not fix it. It's really a bug with sddm.

Thank you,

F

[Robin Laing]

On 24/08/2020 22:32, Frédéric wrote:
> > 2 things to try:
> > disable session management, systemsettings5->startup&shutdown->desktop
> >
> > session, On Login chose option *other* than "Restore previous session"
>
> That was already set to "Start with an empty session".
> > enable logind feature to kill user processes on logout, edit
> >
> > /etc/systemd/logind.conf , set key
> > KillUserProcesses=yes
>
> This did not fix it. It's really a bug with sddm.
>
> Thank you,
>
> F
> ___________

I agree there is a problem but not 100% sure it is sddm.

I have a similar and may be the same problem.

I use multiple users to isolate work from play and I have had issues 
with one account that when I logout, it freezes with the background 
showing.  Mouse moves but nothing works in it.

There are enough processes running and I go into another account and 
slowly kill them off.  I have had KillUserProcesses=yes set for a very 
long time on this machine.

The last process I end up killing it the sddm-helper session for that 
user.

I have had this on both F31 and F32 but have not had the time or energy 
to try to do any debugging on it.

I have it set to start with an empty session.

On logout it freezes.

Other accounts don't freeze like this on this machine.  I have another 
account that I have never had freeze up this way.

Under top, these are the processes that are running for this user after 
an attempt to logout.

dbus-broker
gvfsd
kglobalaccel5
dconf-service
abrt-applet
pulseaudio
agent
kactivitymanage
at-spi-bus-laun
dbus-broker-lau
dbus-broker
gconf-helper
gconfd-2
kscreen_backend
at-spi2-registr
kdeconnectd

gconf-helper will remain a zombie until pulseaudio is killed.

I think there is a process that cannot be stopped and is preventing sddm 
from working properly.

I usually have at least two different session open on this machine at 
all times and will open a third and/or fourth session from time to time.

Robin