Well im on gentoo right now!
i dont have a usb keyboard,
I DO THOUGH!! have a usb mouse i in the guide it says that if you wnat it to work you need to do this!!
in you xconfig when you umm........edit it make sure you have this!!!
Option "Protocol" "ExplorerPS/2"
Option "Device" "/dev/input/mice" <------------THIS!!! to make the mouse wor
if that works im guees you can do the same for the keyboard!!
im on Gentoo like i said if you need help i can help you!!
go to my site im always there checking my forums for people that need help!