Please use latest mainline kernel here:

And do this:
$ sudo sh -c 'echo -n "elantech" > /sys/bus/serio/devices/serio1/protocol'

Hopefully it'll work.

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  ETPS/2 Elantech Touchpad inconsistently detected (Lenovo Y700 15ISK)

Status in linux package in Ubuntu:

Bug description:
  This has been happening reliably on my Lenovo Y700 15ISK since
  15.10... Sometimes it shows up as ETPS/2, sometimes PS/2, sometimes
  Logitech Wheelmouse... Most of the time it shows as "PS/2 Logitech
  Wheel Mouse" but none of the multitouch (2 finger scroll, 3 finger
  middle-click) can be set up. synclient says no device is present.

  This is likely related to:

  ProblemType: Bug
  DistroRelease: Ubuntu 17.04
  Package: linux-image-4.10.0-19-generic 4.10.0-19.21 [modified: 
  ProcVersionSignature: Ubuntu 4.10.0-19.21-generic 4.10.8
  Uname: Linux 4.10.0-19-generic x86_64
  ApportVersion: 2.20.4-0ubuntu4
  Architecture: amd64
   /dev/snd/controlC0:  dphillips   1280 F.... pulseaudio
  CurrentDesktop: XFCE
  Date: Tue Apr 18 07:40:12 2017
  InstallationDate: Installed on 2017-04-18 (0 days ago)
  InstallationMedia: Xubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
  MachineType: LENOVO 80NV
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.10.0-19-generic.efi.signed 
root=UUID=8bba488a-b6df-4c29-8a90-8811c1078048 ro quiet splash i8042.kbdreset=1 
   linux-restricted-modules-4.10.0-19-generic N/A
   linux-backports-modules-4.10.0-19-generic  N/A
   linux-firmware                             1.164
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install) 09/19/2016
  dmi.bios.vendor: LENOVO
  dmi.bios.version: CDCN53WW
  dmi.board.asset.tag: NO Asset Tag Allsparks 5A
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0J40709 WIN
  dmi.chassis.asset.tag: NO Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Lenovo ideapad Y700-15ISK
dmi:bvnLENOVO:bvrCDCN53WW:bd09/19/2016:svnLENOVO:pn80NV:pvrLenovoideapadY700-15ISK:rvnLENOVO:rnAllsparks5A:rvrSDK0J40709WIN:cvnLENOVO:ct10:cvrLenovoideapadY700-15ISK: 80NV
  dmi.product.version: Lenovo ideapad Y700-15ISK
  dmi.sys.vendor: LENOVO

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