Found the culprit: it's the Intel GPU.

If I use Intel IGP, the situation is as I described. If I use the nvidia
graphics card, everything works fine with gnome+org, acpi=on.

I've read that support on the IGP for i7-7700HQ on linux is still
ongoing work, so I guess I'll have to wait before I can use it, or do
without touchpad, suspend, etc.

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

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https://bugs.launchpad.net/bugs/1738560

Title:
  touch pad stopped working after upgrade to artful 17.10

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