Comment 22 for bug 427805

@Märt, yeah that's something nasty. I tried plug and un-plug my power several times but didn't managed to get this reproduced. But once it happens, it seems to last forever. So a possible way to verify is to use the original libusb package first, and til this issue happens, install the updated one, and try start upower on command line to see if it crashes. gnome-power-manager seems to be staying at an incorrect state once upowerd crashes, so you may want to kill and start gnome-power-manager manually to bring it back to a right state.