Try this:
$ sudo sh -c 'echo -n "elantech" > /sys/bus/serio/devices/serio2/protocol

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https://bugs.launchpad.net/bugs/1688625

Title:
  Linux does not recognize the Hantick touchpad as a touchpad and does
  not enable all the functions

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Hello,
  We have laptops with touchpad Hantick, that on Miscrosft Windows work with 
Elan driver.

  Linux does not recognize the Hantick touchpad as a touchpad and does
  not enable all the functions of evdev or libinput.

  Thanks
  --------

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-77-generic 4.4.0-77.98
  ProcVersionSignature: Ubuntu 4.4.0-77.98-generic 4.4.59
  Uname: Linux 4.4.0-77-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  slimbook   1720 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Fri May  5 20:01:33 2017
  HibernationDevice: RESUME=UUID=eef047d2-92ea-4166-a300-7a4de6af1448
  InstallationDate: Installed on 2017-05-05 (0 days ago)
  InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 
(20160719)
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 004: ID 090c:037c Silicon Motion, Inc. - Taiwan (formerly 
Feiya Technology Corp.) 300k Pixel Camera
   Bus 001 Device 003: ID 8087:0a2a Intel Corp.
   Bus 001 Device 002: ID 0bda:0129 Realtek Semiconductor Corp. RTS5129 Card 
Reader Controller
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: SLIMBOOK KATANA
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-77-generic.efi.signed 
root=UUID=00a6febb-4980-4147-a2e8-29930aed3d30 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-77-generic N/A
   linux-backports-modules-4.4.0-77-generic  N/A
   linux-firmware                            1.157.8
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/25/2016
  dmi.bios.vendor: INSYDE Corp.
  dmi.bios.version: 16L
  dmi.board.asset.tag: Type2 - Board Asset Tag
  dmi.board.name: KATANA
  dmi.board.vendor: SLIMBOOK
  dmi.board.version: Type2 - Board Version
  dmi.chassis.asset.tag: Chassis Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: SLIMBOOK
  dmi.chassis.version: Chassis Version
  dmi.modalias: 
dmi:bvnINSYDECorp.:bvr16L:bd07/25/2016:svnSLIMBOOK:pnKATANA:pvrTBDbyOEM:rvnSLIMBOOK:rnKATANA:rvrType2-BoardVersion:cvnSLIMBOOK:ct10:cvrChassisVersion:
  dmi.product.name: KATANA
  dmi.product.version: TBD by OEM
  dmi.sys.vendor: SLIMBOOK

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