sul mio HP dmesg mi da, tra l'altro queste righe

mice: PS/2 mouse device common for all mice
e
Synaptics Touchpad, model: 1, fw: 5.8, id: 0x1d48b1, caps: 0x904713/0x4006
input: SynPS/2 Synaptics TouchPad as /class/input/input1
input: HID 1241:1166 as /class/input/input2
input: USB HID v1.10 Mouse [HID 1241:1166] on usb-0000:00:1d.0-1

lsusb

root@Knoppix:/home/giorgio# lsusb
Bus 001 Device 002: ID 1241:1166 Belkin


lspci

non dice nulla d'interessante

in /etc/X11/xorg.conf

Section "ServerLayout"
Identifier "XFree86 Configured"
Screen 0 "Screen0" 0 0
InputDevice "Keyboard0" "CoreKeyboard"
# PS/2 Mouse not detected
# Serial Mouse not detected
InputDevice "USB Mouse" "CorePointer"
EndSection

Section "InputDevice"
Identifier "Keyboard0"
Driver "kbd"
Option "CoreKeyboard"
Option "XkbRules" "xorg"
Option "XkbModel" "pc105"
Option "XkbLayout" "it"

Section "InputDevice"
Identifier "USB Mouse"
Driver "mouse"
Option "Device" "/dev/input/mice"
Option "SendCoreEvents" "true"
Option "Protocol" "IMPS/2"
Option "ZAxisMapping" "4 5"
Option "Buttons" "5"

ho un mouse usb.

Del touchpad non c'è traccia, eppure funziona perfettamente assieme al mouse