Hello,
i've just installed gentoo with kernel 2.6.27-r8 on a fujitsu-siemens 
Amilo 1655G laptop and it works perfectly.
But sometimes happens that the keyboard wont be recognised by the kernel 
after boot.
So i looked at dmesg output.
Normally the following lines appear, but in non working case they don't:

input: AT Translated Set 2 keyboard as /class/input/input3
input: PS/2 Mouse as /class/input/input4
input: AlpsPS/2 ALPS GlidePoint as /class/input/input5

Maybe somebody had the same problem and can tell me whats wrong.

I've added dmesg output for both cases.