I think if you run gpm, in X the mouse should be configured with device "/dev/gpmdata" and protocol "MouseSystems". At least it works on my system, but I have a different mouse. You can try anyway...
Regards, -- Joachim Fahnenmüller Lehrer für Mathematik und Physik Herder-Gymnasium Kattowitzer Straße 52 51065 Köln