Please try VT switching to VT4 (Ctrl+Alt+F4), log in and retest with
'evtest'. If you continue to get no results then that's a kernel bug.
Because Wayland and libinput are not part of the equation when you're
testing the kernel directly.

P.S. Also check if your laptop keyboard has a function key for
disabling/enabling the touchpad. It might simply be disabled in hardware
(for reasons unknown).

** Package changed: libinput (Ubuntu) => linux (Ubuntu)

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

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https://bugs.launchpad.net/bugs/1726934

Title:
  Elantech touchpad unresponsive in Ubuntu 17.10

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  I have upgraded to Ubuntu 17.10 on my Asus Vivobook X505BA laptop and
  with the upgrade to Wayland full-time, all of the elantech issues from
  a few years back are coming back with a vengeance. Upon upgrade, my
  trackpad is no longer functional and I am forced to use an external
  mouse. I don't have an extra mouse that I can just drag around with
  the laptop, nor do I wish to purchase one to use when I have a
  trackpad on the laptop itself. Dmesg doesn't show anything about the
  driver failing to load and syslog shows nothing either. I know this is
  a common issue with this kind of trackpad but I hope to see a fix soon
  so I can go back to using Ubuntu normally

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