What were you trying to do that didn't work?

The customer needs to configure StopIdleSessionSec in /etc/systemd/logind.conf, but it killing GDM leaving blank console with flashing underscore.

How reproducible:
Everytime

=======================
REPRODUCER
=======================

• Install RHEL8.9, select Workstation.

~~~
cat /etc/redhat-release
Red Hat Enterprise Linux release 8.9 (Ootpa)

rpm -q systemd gdm
systemd-239-78.el8.x86_64
gdm-40.0-27.el8.x86_64
~~~

• Add StopIdleSessionSec=100 to /etc/systemd/logind.conf:

~~~
[root@localhost ~]# grep -v ^# /etc/systemd/logind.conf

[Login]
StopIdleSessionSec=100
~~~

• Restart the service:

~~~
~]# systemctl restart systemd-logind
~~~

• Login again with user and password. The console is black with a flashing underscore. But if I enter Ctrl+C, the login screen appears again and after enter user and password the login is successful.
  =======================

Expected results

Login screen should get locked after mentioned time.

Actual results

The console is black with a flashing underscore.