FWIW here are the pertinent parts of my xorg.conf:
# Xorg configuration created by system-config-display
Section "ServerLayout"
Identifier "single head configuration"
Screen 0 "Screen0" 0 0
InputDevice "Mouse0" "CorePointer"
InputDevice "Keyboard0" "CoreKeyboard"
EndSection
...
Section "InputDevice"
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "IMPS/2"
Option "Device" "/dev/input/mice"
Option "ZAxisMapping" "4 5"
Option "Emulate3Buttons" "yes"
EndSection
My settings are identical. However, I am using a USB mouse(MS
Intellimouse Optical) with a PS2 adapter on a belkin KVM. Shouldn't be
an issue, but is this something too weird?