reboot hang

[Petri Helenius]

I cannot say specifically when, but in the late 5.3-BETA's (cvsupped 
BETA7 today) I'm having the system hang over a reboot. The hang happens 
late enough for DDB escape or even the keyboard not responding. The last 
message on the screen is "Shutting down ACPI".

Any ideas where to look next? This both machines that this happen on 
have em interface but don't have any other obvious thing in common. The 
one is P4SCE Supermicro board and the other Thinkpad X31.

Pete