Comment 6 for bug 306363

strongly related problem : from Bug #281651

and retested on my configuration :
while a menu from a gnome desktop bar is open, using the brightness hotkey will :
- correctly modify the brightness setting
- but NOT show the notification and the progress bar

when closing the described menu afterwards, the brightness notification bar shows up, and i end up in the same locked situation as described 2 posts up. --> for this reason i mark the Bug #281651 also as duplicate of this one

The problem seems mainly to come from the way gnome-power-manager handles this notification, and that it hangs on it afterwards..