edit your xorg.conf which is located in /etc/X11/
looking through the file you should see something about mice:
Code:
# **********************************************************************
# Core Pointer's InputDevice section
# **********************************************************************
Section "InputDevice"
# Identifier and driver
Identifier "Mouse1"
Driver "mouse"
# On platforms where PnP mouse detection is supported the following
# protocol setting can be used when using a newer PnP mouse:
# Option "Protocol" "Auto"
# The available mouse protocols types that you can set below are:
# Auto BusMouse GlidePoint GlidePointPS/2 IntelliMouse IMPS/2
# Logitech Microsoft MMHitTab MMSeries Mouseman MouseManPlusPS/2
# MouseSystems NetMousePS/2 NetScrollPS/2 OSMouse PS/2 SysMouse
# ThinkingMouse ThinkingMousePS/2 Xqueue
Option "Protocol" "IMPS/2"
Option "ZAxisMapping" "4 5"
just change the Option Protocol to IMPS/2 and add the Option "ZAxisMapping" "4 5" like i have above, restart x and tada!