APM: disable mouse interrupt?

[Krzys Majewski <krzys@cs.mcgill.ca>]

How can I disable the mouse interrupt for APM so that moving the mouse
does not resume the machine? (The  mouse is on my desk, there are other
things on my desk, some of these things move occasionally, etc.) 
I tried disabling IRQ4 in the  apm section of the bios setup, which I
*think* is my mouse interrupt because 

14:29:24<~>$ setserial /dev/ttyS0
/dev/ttyS0, UART: 16550A, Port: 0x03f8, IRQ: 4

and because 

14:29:25<~>$ ls -la /dev/mouse
lrwxrwxrwx    1 root     root            7 Aug 30 15:54 /dev/mouse -> gpmdata
14:29:50<~>$ ls -la /dev/modem
lrwxrwxrwx 1 root root 10 Aug 27 06:20 /dev/modem -> /dev/ttyS1

but no go. Then again, /proc/interrupts says:

12:     130888          XT-PIC  PS/2 Mouse

Note that 12 != 4. WTF? -chris