gpm is version 1.10. The mouse in question is a two-button Compaq PS/2
mouse. The motherboard is Asus P55T2P4, and the bios detects the
presence of a mouse. If the mouse is disconnected at boottime, the
bios switches the PS/2 interface off. The kernel detects the interface
fine, too, but as far as I can see the kernel just believes whatever
the BIOS tells it.
The keyboard is a good old no-name AT-keyboard.
Benny