> > If USB is disabled on a server works MB reboots hang in 2.2.x
>
> In almost all cases a hang after Linux reboots the system and it not coming
> back to the BIOS is a BIOS bug.
>
> You can confirm this by asking the kernel to do a real bios reboot with
> the reboot= option
>
For those besides me who were wondering where this is documented,
find . ! -type d ! -type l -exec grep "reboot=" {} \; -print
of /usr/src/linux revealed that it is only documented in
./Documentation/Changes
Here is the pertinant paragraph:
General Information
===================
<CTRL><ALT><DEL> now performs a cold reboot instead of a warm reboot
for increased hardware compatibility. If you want a warm reboot and
know it works on your hardware, add a "reboot=warm" command line option
in LILO. A small number of machines need "reboot=bios" to reboot via
the BIOS.
Note that ./Documentation/kernel-parameters.txt only contains:
reboot= [BUGS=ix86]
Jay
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