Comment 43 for bug 150846

Same bug on Hardy, I have backports on.
The freeze occurs with and without compiz, with / without proprietary nvidia drivers.

I confirm the behaviour stated above : before clicking on "quit", gnome-power-manager is not running, after clicking on the button it is running.

Starting gnome-power-manager *before* clicking on "quit" prevents the freeze. It seems that the "quit" dialog starts gnome-power-manager if it sees it's not running, but fails to communicate with it (just my humble analysis).

When I was using gutsy, I didn't have the freeze, but the first time I'd click on the "quit" button, I'd have a dialog WITHOUT "suspend" and "hibernate", and when canceling and clicking again on "quit", I'd have those two entries back, and this would stay the same upon canceling & quitting again.

I think there is a connexion : the first time, the quit dialog would start gnome-power-manager without "talking" to it, and on the second run, it would communicate with the existing gnome-power-manager.