Once upon a time, back in FC5, one of the versions of fglrx would totally freeze up my system when the X server exited, or even if you just tried to get to the console window via Ctrl-Alt-F1. Recent versions of the FC5 fglrx don't have this problem, so something was fixed. Unfortunately, the latest livna fglrx for x86_64 FC6 has this problem again (sigh). Anyone have any recollection of what the problem was and how it was fixed before? My only work-around right now is to get into the system via ssh from another computer and kill -9 the X server and then run reboot. At least that shuts it down cleanly instead of suddenly freezing up.