I bought a Dell XPS Notebook, and it works fine except for the Touchpad. It works with Ubuntu 12.4 and seems to be supportet from Kernel > 3.16
I suppose my Firmware is to old (A05), A07 is the actual one.
The firmware comes as exe file, and it seems to install automatically in Windows 8 and ubuntu 12.4.
Does anybody have an XPS or a similar notebook and knows about the problem? Is there a way to install from the bios? Just writing the exe file to a fat stick doesn't work (found that tip on the net).