I have the same Problem with my XT 3. Did you solve the Problem? I installed and re installed all drivers but the buttons are not working.
I have just re-formatted my Dell XT and I've downloaded all the necessary drivers (I think) but my screen does not automatically rotate the 90 degrees it should when I put it into slate mode, neither do the tablet buttons that would allow me to do that work.
I have double checked Dell's driver download site and can't find the driver that would fix this problem..
what do i do!?
All help greatly appreciated