I remember something similar happening when I chose the wrong protocol for my mouse a long time ago. It was all XFree86 back then, but I guess it is still the same issues for the mouse. Remember that the Synaptics is usually a PS2 device, you may have to use /dev/psaux for communicating properly with it.
;)Frode -- Input system crazy after suspend https://launchpad.net/bugs/57908 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs