Comment 13 for bug 439552

I'm not sure, I think there was a TODO comment in the code about actually logging the event. You could start polkit-gnome-authentication-agent-1 in a terminal an monitor the output from that application. In that case you probably have to kill to old instance of polkit-gnome-authentication-agent-1 and start it afterwards. Remember that polkit doesn't work when the authentication agent isn't running, but I guess not much of an issue for you since it doesn't work anyway.