Hi,
Not 100% conclusive.
I have just booted LL2 Live from USB Stick on an HP TS15, not quite ready to install it yet.
The touch screen seems to work O.K, but I have only tried opening and closing and dragging a few things.
Sorry, just re-read your post...
I think you are referring to external monitors with touch screen that connect via USB.??
vs
Laptops Display(Monitor) with Touch Screen
David