edit your /etc/X11/XF86Config file and look for the section
Section "InputDevice"
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "ImPS/2"
Option "Device" "/dev/psaux"
Option "ZAxisMapping" "4 5"
Option "Emulate3Buttons" "no"
theres mine, i think you need the ZAxisMapping, but it might also be the ImPS/2
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