On Mon, Dec 10, 2012 at 12:50:36PM +0200, Andrei POPESCU wrote: > > is there any service which monitors status of Ethernet and changes Network > > manager's icon on gnome-control-panel? > > Network Manager. For GNOME3, nm does not draw the icon in the display, gnome-shell overrides it and provides its own. I've had gnome-shell and nm fall out / lose d-bus connection or something else more than once, and that may be a related problem here.