The X server input drivers are in flux at the moment, it will stabilise before Beta, have no fear :-)
What's happening is that your touchpad is being handled by the correct touchpad driver when it works, but a generic mouse driver when it doesn't.
The X server input drivers are in flux at the moment, it will stabilise before Beta, have no fear :-)
What's happening is that your touchpad is being handled by the correct touchpad driver when it works, but a generic mouse driver when it doesn't.