Ah... I dunno which screen you got, but this one sez it's treated as a usb mouse over hdmi:
Quote:
This version has touch screen capability. The touch screen shows up as a USB mouse so no special drivers needed. We've tested it sucessfully on Mac, Windows, and Debian Linux (Raspbian on a Raspberry Pi).
https://www.adafruit.com/product/2260EDITED: 14 Sep 2018 16:06 by DSMITHHFX