how to enable auto power off

[Tadimeti Keshav]

Guys,
I have a D815EPEA intel based motherboard. My
dual-boot Redhat 9.0 setup can automatically shutdown
and power off. But freeBSD can't do that (yet). 

Are there any flags I need to set in rc.conf or what
do I need to set to recompile the kernel?
I use freeBSD 4.5.
THanks

________________________________________________________________________
Want to chat instantly with your online friends?  Get the FREE Yahoo!
Messenger http://mail.messenger.yahoo.co.uk