For typical scroll USB mice, configuration combinations should be:

     /etc/gpm.conf            | /etc/X11/XF86Config-4
     =========================+======================================
     device=/dev/input/mice   | Section "InputDevice"
     responsiveness=          |  Identifier "Generic Mouse"
     repeat_type=raw          |  Driver     "mouse"
     type=autops2             |  Option     "SendCoreEvents" "true"
     append=""                |  Option     "Device"   "/dev/input/mice"
     sample_rate=             |  Option     "Protocol" "IMPS/2"
                              |  Option     "Buttons" "5"
                              |  Option  "ZAxisMapping" "4 5"
                              | EndSection