Feel a bit silly, I just realised that a year ago I had created an event
script to disable the touchpad in tablet mode due to thinkpad acpi
driver bug. However I used the event number instead of a unique symlink
and with kernel updates the event number remapped to the touchscreen and
thus disabled it in tablet mode. All fixed now, sorry for noise!

** Changed in: linux (Ubuntu)
       Status: Confirmed => Invalid

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https://bugs.launchpad.net/bugs/1788049

Title:
  Kernel 4.15.0 updates disabling touchscreen in tablet mode on X1 Yoga

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