I also have a t480, mines running Ubuntu but unfortunately I’m giving it up for a new MacBook Air. The touchpads on the thinkpads are beyond horrible after using macs for many years, it’s finally too annoying for me to keep going :(
Try disabling the trackpad and then just use the trackpoint.
I always disable the trackpad but I fear someday thinkpads might drop the trackpoint altogether as I don't see many people using them.