I have the same issue with a laptop gigabyte m1405: Touchpad do not work 
neither under X, neither with gpm.

It is detected as a "Macintosh mouse button emulation"

in dmesg:
input: Macintosh mouse button emulation as /devices/virtual/input/input4

in /var/log/Xorg.log:
(II) config/udev: Adding input device Macintosh mouse button emulation 
(/dev/input/event4)

but from dmidecode:
Handle 0x000D, DMI type 21, 7 bytes
Built-in Pointing Device
        Type: Touch Pad
        Interface: PS/2
        Buttons: 4

-- 
Laptop ALPS touchpad not detected, not working
https://bugs.launchpad.net/bugs/377741
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