I have a dell (inspiron n5110) laptop and manual book said that i can scroll using two fingers on the touch-pad and scroll up, down, left, and right it workd in windows but that didn't happen in Ubuntu 11.10.how to make this enable ???
if someone still looking for the solution so:
open "System Settings" then click on "Mouse and Touchpad", then select the "Touchpad" tab
and there deselect "Two Finger scrolling"
and if you want normal scrolling so deselect either the "natrual scrolling"
(enable it just if you want a scroll like apple).
based on the xinput information you showed, it looks like your touchpad is not being recognized as such, but rather, as a simple PS/2 mouse with no scroll capabilities.
Dell has started using ALPS touchpads, which sometimes need some fiddling to make work, hopefully answers to this question will help you: