Hey Ted,
Are you able to run:
sudo evemu-record
Which should look like this:
sudo evemu-record
Available devices:
/dev/input/event0: Sleep Button
/dev/input/event1: Lid Switch
/dev/input/event2: Power Button
/dev/input/event3: AT Translated Set 2 keyboard
/dev/input/event4: Yubico Yubico Yubikey II
/dev/input/event5: ThinkPad Extra Buttons
/dev/input/event6: HDA Intel PCH Mic
/dev/input/event7: Video Bus
/dev/input/event8: HDA Intel PCH Headphone
/dev/input/event9: HDA Intel PCH HDMI/DP,pcm=3
/dev/input/event10: HDA Intel PCH HDMI/DP,pcm=7
/dev/input/event11: HDA Intel PCH HDMI/DP,pcm=8
/dev/input/event12: HDA Intel PCH HDMI/DP,pcm=9
/dev/input/event13: HDA Intel PCH HDMI/DP,pcm=10
/dev/input/event14: Integrated Camera: Integrated C
/dev/input/event15: Elan Touchpad
/dev/input/event16: Elan TrackPoint
/dev/input/event17: M720 Triathlon Keyboard
/dev/input/event18: M720 Triathlon Mouse
/dev/input/event19: Logitech M720 Triathlon
/dev/input/event20: Logitech K850
/dev/input/event21: Lenovo ThinkPad USB-C Dock Audio
Then select the appropriate device. In my case, it is the Elan TrackPoint, device 16. So I type 16 and press enter
Full disclosure, I'm not a Software Engineer, but this information will likely be useful in troubleshooting this issue.