AMD64 + FreeBSD 6.1 + Keyboard troubles

Sat Nov 11 23:32:23 UTC 2006

I've installed FreeBSD 6.1 on a new Dual AMD Opeteron HE server, during the
installation the keyboard works fine. But when you plug in the keyboard
after a reboot (without the keyboard attached) the keyboard won't work any
more. I'm doing the same installation on a Dual Intel Xeon machine and the
keyboard works fine after a reboot and a cold plug in.

Could this be a motherboard problem or is this something within BSD?