Same issue here, running Ubuntu 17.10 on a Lenovo Thinkpad T440.

Touchpad + trackpoint move between these three states:
1) everything works fine: touch to click, touch pad, two finger 
scroll/right-click and trackpoint
2) everything except for two-finger actions work
3) nothing works: touchpad + trackpoint unresponsive

All of this seems to happen at random. Putting the machine into suspend
and waking it up again will put it in a random state of working/not
working.

This behavior was not observed when running 17.04 or 16.10.

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https://bugs.launchpad.net/bugs/1550270

Title:
  Touchpad stops working randomly

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