This system also has a touchscreen:
43: USB 00.0: 10503 USB Mouse
[Created at usb.122]
Unique ID: wkjR.g8Htg37jFyE
Parent ID: k4bc.2DFUsyrieMD
SysFS ID: /devices/pci0000:00/0000:00:14.0/usb1/1-5/1-5:1.0
SysFS BusID: 1-5:1.0
Hardware Class: mouse
Model: "Elan Microelectronics Touchscreen"
Hotplug: USB
Vendor: usb 0x04f3 "Elan Microelectronics Corp."
Device: usb 0x2052 "Touchscreen"
Revision: "10.13"
Compatible to: int 0x0210 0x0000
Driver: "usbhid"
Driver Modules: "usbhid"
Device File: /dev/input/mice (/dev/input/mouse2)
Device Files: /dev/input/mice, /dev/input/mouse2, /dev/input/event14,
/dev/input/by-id/usb-ELAN_Touchscreen-event-if00,
/dev/input/by-path/pci-0000:00:14.0-usb-0:5:1.0-event
Device Number: char 13:63 (char 13:34)
Speed: 12 Mbps
Module Alias: "usb:v04F3p2052d1013dc00dsc00dp00ic03isc00ip00in00"
Driver Info #0:
Buttons: 0
Wheels: 0
XFree86 Protocol: explorerps/2
GPM Protocol: exps2
Config Status: cfg=new, avail=yes, need=no, active=unknown
Attached to: #39 (Hub)
If I blacklist elants_i2c, oddly the touchpad and touchscreen both
still work - possibly this is significant?