Hi,

Same happened to me. Well, sort of. After upgrading, my ps/2 mouse began moving erratically. It looked like it was using the wrong protocol, but according to XF86Config-4 IMPS/2 is the protocol being used (and the right one, for it was the one I was using before the upgrade)

The solution (i know it's not a grrrreat one though) was plugging the mouse to the usb port through an adaptor. I changed the XF86Config-4 file accordingly and I've had no more problems since.

Well, I hope this to be useful to you (though I doubt it... )

Ganbatte kudasai