I think I just had a huge breakthrough, after installing a kernel 4.14.0
with all of the patches referenced here, suddenly the touchpad was
working. I went ahead and rebooted and sure enough the touchpad was not
working again. Then I thought, what if I suspend the computer? And sure
enough, the touchpad magically starts working after the computer wakes
up. I think there's some device initialization code that gets called on
wake-up that is missed on boot.

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https://bugs.launchpad.net/bugs/1728244

Title:
  Touchpad stops working after reboot on Apollo Lake

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