How can you debug a system hang during shutdown?
My Feodora 11 AMD 64 system has begun hanging when I shutdown. It drops the window manager and goes to a blank screen. Sometimes there is a blinking cursor in the upper left hand corner, but mostly it is a dark grey screen and then sits.
I have gone through syslog/messages to see if I can decipher anything, with no luck (don't really know precisely what to look for).
How do you debug something like this?
The system is fairly clean. I am running samba and mdadm (for a raid 5 disk configuration), but nothing else other than desktop type apps. I do have the NVIDIA driver installed and the various codecs for video/audio playback.
Any ideas will be appreciated.