The trackpoint of the ThinkPad X1 Tablet Gen 3 detachable keyboard (USB
17EF:60B5) lives in the same HID interface as the touchpad, which is
bound to hid-multitouch. The kernel never sets INPUT_PROP_POINTING_STICK
for it, so input_id classifies the trackpoint as a plain mouse.
Mark it as a pointing stick so libinput applies trackpoint acceleration
instead of the mouse acceleration profile.
The interface also exposes a second mouse node without a middle button;
the modal match keys on the button set (k110,111,112) to select only the
trackpoint node and leave the touchpad and the other mouse node
untouched.
Similar to d13c07ecd8 and 373a4020d5, 65-integration.rules sets
ID_INPUT_TOUCHPAD_INTEGRATION=external, and libinput skips
disable-while-typing (DWT) for the device.
The touchpad is integrated into a detachable keyboard which isn't usable
on other devices so it should be marked as internal. This enables palm
detection and DWT.
Stephanie Wilde-Hobbs