[LightDM] systemd cooperation

[Martin Briza]

Well, I reproduced the same behavior in Ubuntu now, too. The only  
difference is that one can switch TTYs while the screen is stuck.
How to do it:
1. Log in user1
2. Switch to greeter, log in user 2
3. ctrl + alt + f7
4. logout
5. bam, vt completely stuck
Log: http://paste.stg.fedoraproject.org/1933/
I would try to report it or add it to some bug already opened but search  
in the bug tracking tool on Launchpad is still redirecting me to the "Lost  
something?" page, sorry for that.
To the difference - there is a problem with login prompt spawning on VTs  
that aren't managed by LightDM, I'm looking into that now. Can't tell  
where is this coming from.