Lenovo Thinkpad P52 is another laptop that uses this touchpad. Same
issues with the kernel detecting/configuring it.

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  Elantech - Touchpad not working after upgrading to 18.10 from 18.04
  (ThinkPad L480|L580|P72)

Status in linux package in Ubuntu:

Bug description:
  When updating from 18.04 to 18.10 on a ThinkPad L480 the Elantech
  touchpad stopped working. This means it is not recognized at all. This
  problem occured after the first boot in 18.10

  `dmesg | grep -i elantech` shows the following errors:

      [    3.409043] psmouse serio1: elantech: assuming hardware version 4 
(with firmware version 0x5f3001)
      [    3.427372] psmouse serio1: elantech: Synaptics capabilities query 
result 0x90, 0x18, 0x10.
      [    3.447275] psmouse serio1: elantech: Elan sample query result 00, 23, 
      [    3.464905] psmouse serio1: elantech: Trying to set up SMBus access
      [    5.576149] elan_i2c 0-0015: 0-0015 supply vcc not found, using dummy 
      [    5.586505] elan_i2c 0-0015: failed to get resolution: -71
      [    5.586527] elan_i2c: probe of 0-0015 failed with error -71


      $ uname -a
      Linux test 4.18.0-10-generic #11-Ubuntu SMP Thu Oct 11 15:13:55 UTC 2018 
x86_64 x86_64 x86_64 GNU/Linux

  I found the following thread which solves the problem temporarly (and reports 
the same problem in Arch):

  Running the following command enables it again for the current

      sudo sh -c 'echo -n "elantech">

  dmesg afterwards:

      [  569.522490] psmouse serio1: elantech: assuming hardware version 4 
(with firmware version 0x5f3001)
      [  569.544584] psmouse serio1: elantech: Synaptics capabilities query 
result 0x90, 0x18, 0x10.
      [  569.565939] psmouse serio1: elantech: Elan sample query result 00, 23, 

  Before running the fix:

      $ cat /sys/bus/serio/devices/serio1/protocol

  and after:

      $ cat /sys/bus/serio/devices/serio1/protocol

  After reboot the command has to be run again, of course.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.10
  Package: xorg 1:7.7+19ubuntu8
  ProcVersionSignature: Ubuntu 4.18.0-11.12-generic 4.18.12
  Uname: Linux 4.18.0-11-generic x86_64
  ApportVersion: 2.20.10-0ubuntu13.1
  Architecture: amd64
  BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
  CompizPlugins: No value set for 
  CompositorRunning: None
  CurrentDesktop: KDE
  Date: Thu Nov 15 20:59:36 2018
  DistUpgraded: 2018-11-10 09:56:53,358 DEBUG icon theme changed, re-reading
  DistroCodename: cosmic
  DistroVariant: ubuntu
   virtualbox, 5.2.18, 4.15.0-38-generic, x86_64: installed
   virtualbox, 5.2.18, 4.18.0-10-generic, x86_64: installed
   virtualbox, 5.2.18, 4.18.0-11-generic, x86_64: installed
   Intel Corporation UHD Graphics 620 [8086:5917] (rev 07) (prog-if 00 [VGA 
     Subsystem: Lenovo UHD Graphics 620 [17aa:506a]
  InstallationDate: Installed on 2018-08-06 (101 days ago)
  InstallationMedia: Xubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 
  MachineType: LENOVO 20LS001AGE
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.18.0-11-generic 
root=UUID=a1f97298-a2b8-469d-80ed-eeee7497c6e6 ro quiet splash vt.handoff=1
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: Upgraded to cosmic on 2018-11-10 (5 days ago)
  dmi.bios.date: 02/09/2018
  dmi.bios.vendor: LENOVO
  dmi.bios.version: R0QET37W (1.14 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20LS001AGE
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0J40697 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.product.family: ThinkPad L480
  dmi.product.name: 20LS001AGE
  dmi.product.sku: LENOVO_MT_20LS_BU_Think_FM_ThinkPad L480
  dmi.product.version: ThinkPad L480
  dmi.sys.vendor: LENOVO
  version.compiz: compiz N/A
  version.libdrm2: libdrm2 2.4.95-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 18.2.4-0~b~padoka0
  version.libgl1-mesa-glx: libgl1-mesa-glx 18.2.4-0~b~padoka0
  version.xserver-xorg-core: xserver-xorg-core 2:1.20.1-3ubuntu2.1
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:18.1.0-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-3

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