I have had the same problem with my keyboard, however it is not a USB keyboard. 
 Mine is a standard 104 key generic Dell brand keyboard, plugged in to the PS/2 
port on my desktop PC.
I've noticed this problem in gdm, kdm, and even in the recovery terminal... the 
only link I managed to find between the behavior was that I've only noticed it 
happening in kernel 2.6.15-19.  I'm using the i686 version, installed from 
Flight 6 with recent updates.  The problem only started after the update to the 
kernel image.

I can confirm the num lock behaviour, it acts as an indicator of sorts to 
whether or not my keyboard will be locked up or not.  If num lock is on when 
gdm/kdm/recovery console starts... then the keyboard doesn't work, if the num 
lock light is off... then it is responsive.
Being a PS/2 keyboard, sadly I am not able to simply fix the problem by 
unplugging/replugging it in.  The problem seems random, and usually a reboot 
(or two,three... etc..) will eventually ge the keyboard to work again (at least 
until the next reboot... sometimes).

So far, I havent' had this problem with kernel image 2.6.15-18-i686/i386, only 
with the -19 versions.
-- 
Usb keyboard dies when gdm starts
https://launchpad.net/malone/bugs/32938

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