I found the problem: Upower was not installed. Installing upower (and restarting Gnome) fixed the problem: The symbol is visible again and the error-messages in terminal are gone.
So please add a dependency on upower and close this bugreport. Thanks, wondering why it worked before, Christian Meyer ___________________________________________________________ WEB.DE DSL: Internet, Telefon und Entertainment für nur 19,99 EUR/mtl.! http://produkte.web.de/go/02/ -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org