[Bug 85730] shutdown, logout, hibernate not working

[bronze]

Public bug reported:

I haven't been able to logout or shutdown or hibernate ever since I
dist-upgraded to Feisty. Can't figure out what is wrong, don't know
where to look. When I choose one of the above action the screen just
goes blank and nothing happens. I then need to hard-reboot or shutdown.

Using halt / shutdown now from terminal works.

** Affects: gnome-session (Ubuntu)
     Importance: Undecided
         Status: Unconfirmed

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shutdown, logout, hibernate not working
https://launchpad.net/bugs/85730