How to fix the "keyboard dead" question ?

[zaxis]

Sometimes after booting freebsd and reaching the slim login screen, i cannot
input anything: the keyboard seems to be dead.  Then i have to reboot
freebsd and the problem disappear !

>uname -a
FreeBSD mybsd.zsoft.com 8.1-RELEASE FreeBSD 8.1-RELEASE #1: Wed Sep  8
09:07:54 CST 2010    
root at mybsd.zsoft.com:/media/G/usr/obj/media/G/usr/src/sys/MYKERNEL  i386

>dmesg -a | grep -i fail
acpi0: reservation of 0, a0000 (3) failed
acpi0: reservation of 100000, 3fde0000 (3) failed

>dmesg -a | grep -i warn
ACPI Warning: Optional field Pm2ControlBlock has zero address or length: 0x      
0       0/0x1 (20100331/tbfadt-655)

Sincerely!

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