Grayed out power-off and reset buttons
There is something that prevends lightdm and even Xfce4 from having working power buttons.
We need to investigate this issue and figure out what is needed.
Maybe useful pointers:
Debian bug 728361 - no consolekit session available when libpam-systemd is present https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=728361
Or most likely Policykit issues http://scarygliders.net/2012/06/20/a-brief-guide-to-policykit/