Comment 40 for bug 1041063

for what it is worth, I have had similar issues. As I move the mouse (12.10) it frequently jumps to the top of screen. I can only describe this as a 'reset' to top center. I am not running Virtualbox and have tried different mouse configurations ( usb, bluetooth, etc..) On a hunch I tried removing the 'psmouse' module and the 'reset' has stopped. Not sure why psmouse was the cause of this, but wanted to share in case that helps anyone else.

Take care