Dear Pascal
This is very strange. I'm going now since 12/31/16, and now its 1/3/17, thus 
somewhere between 3-4 days.
I have tested it, and have not seen any problem.

You suggest removing the trackpad in the bios. That worked for me in the past 
(limited success), but with my present BIOS (the latest, I can give you the 
number if you request), the OS ignores the BIOS setting.
Here is the test of that:
1) deselect the trackpad in the bios
2) reboot
3) Before you log in, test if the trackpad is active. I find that it is. 
4) login, and with the "system settings/mouse/touchpad" I now see not reference 
to the touchpad in that 
screen.

Conclusion: After removeing the touchpad via the BIOS, it was still working 
after a reboot. And, there was
no way to turn it on or off from "system settings"

Using my Dell latitude, the behaviour is quite different. So the above
is restricted to the X250.

Jont

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https://bugs.launchpad.net/bugs/1506817

Title:
  left TPP/2 IBM TrackPoint "sticks on" randomly (X250 15.04)

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