Comment # 4 on bug 1171115 from Matthias Gerstner

I was able to reproduce the issue. KDE Plasma behaves strange when trying to
reboot or shtudown when the respective polkit action is on auth_*.

The problem roots deeper than the power-off and reboot polkit actions,
however. The following set of actions is available:

org.freedesktop.login1.power-off
org.freedesktop.login1.reboot
org.freedesktop.login1.hibernate
org.freedesktop.login1.suspend
org.freedesktop.login1.halt

org.freedesktop.login1.power-off-multiple-sessions
org.freedesktop.login1.reboot-multiple-sessions
org.freedesktop.login1.hibernate-multiple-sessions
org.freedesktop.login1.suspend-multiple-sessions
org.freedesktop.login1.halt-multiple-sessions

I think we can relax the single-session actions. The mutiple-sessions actions
should not be relaxed, however, because this would allow any local user to
quit other local or remote user sessions. Furthermore KDE Plasma also behaves
badly the same way when multiple sessions are open and the multiple-sessions
action is on auth_*.

There is definitely some bug in KDE that needs to be fixed.