Comment 15 for bug 377741

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