Your "InputDevice" section in /etc/X11/XF86Config-4 should have something like this
Quote:
Section "InputDevice"
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "IMPS/2"
Option "Device" "/dev/psaux"
Option "ZAxisMapping" "4 5"
Option "Emulate3Buttons" "no"
EndSection
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Sometimes you'll have "PS/2" there (only the IMPS/2 will recognize the wheel so you can use it to scroll around), and that messes up the mouse movement.
Hope it helps,
mlp