I am running Ubuntu 12.10 on a HP Envy 4t-1105dx with touchscreen. Everything except Wifi (Atheros AR9565 doesn't work out of the box) and touchscreen (mostly working) works.
I believe that the Envy i have has an Atmel Maxtouch Digitizer.
When I'm on Firefox and certain other programs, attempting to scroll using the touchscreen si recognized as a click and drag/select motion as if I were holding down the mouse button to drag and highlight something.
Using the scroll bar on the side works.
Drag scrolling in Documents Viewer works.
Another problem is that while clicking generally works on the touchscreen, when I try to click folders or files using the touchscreen in Nautilus, the file/folder is only highlight.
Besides this problem using the touchscreen is fine save for the lack of gestures in gnome shell. Utouch is not in 12.10 anymore sadly. Why I have no idea.