I'm having the same problem on my old 12" iBook G4.
I installed xserver-xorg-input-kbd_1.4.0-1_powerpc.deb from debian sid and added Option "AllowEmptyInput" "off" to my xorg.conf as the instructions in the bug description suggests, and that does indeed make the keyboard work again. This was not necessary in karmic though. udev issue?
I'm having the same problem on my old 12" iBook G4.
I installed xserver- xorg-input- kbd_1.4. 0-1_powerpc. deb from debian sid and added Option "AllowEmptyInput" "off" to my xorg.conf as the instructions in the bug description suggests, and that does indeed make the keyboard work again. This was not necessary in karmic though. udev issue?