f16 :: kdm :: disabled keyboard at boot (thinkpad t420)

[Adrian Sevcenco]

Hi! i have a very strange problem with the laptop from $subj
If i start the system without AC connection at the kdm i have the 
keyboard disabled (but touchpad and trackpad are working fine)
If i recycle hard and connect the AC the keyboard is fine!!!!
Have anyone any idea about this strange thing???!!!
Thanks!
Adrian