odhlášení

Ahoj, mám problém odhlásit určitého uživatele? Jde to nějak v KDE4?
ps:
logout uživatel nejde
ani
loginctl kill-user
logintctl terminate-user

~ % sudo loginctl kill-user a :(
Failed to issue method call: Input/output error

~ % systemctl suspend
User a is logged in on seat0.
Please retry operation after closing inhibitors and logging out other users.