Please test latest mainline kernel:
https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.3-rc5/

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https://bugs.launchpad.net/bugs/1840962

Title:
  No touchpad detected Lenovo P50

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  My Lenovo P50 has a touchpad and a pointing device. Neither are
  detected by Ubuntu 19.04. Both work perfectly when I boot this machine
  into Windows 10.

  Output from this command is attached:
  cat /proc/bus/input/devices > ~/devices

  Thanks,

  Greg

  ProblemType: Bug
  DistroRelease: Ubuntu 19.04
  Package: linux-image-5.0.0-25-generic 5.0.0-25.26
  ProcVersionSignature: Ubuntu 5.0.0-25.26-generic 5.0.18
  Uname: Linux 5.0.0-25-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.10-0ubuntu27.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  greg       2730 F.... pulseaudio
   /dev/snd/controlC0:  greg       2730 F.... pulseaudio
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Aug 21 11:19:50 2019
  InstallationDate: Installed on 2018-10-09 (316 days ago)
  InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 
(20180725)
  MachineType: LENOVO 20ENCTO1WW
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 EFI VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.0.0-25-generic 
root=UUID=5b44139e-ca55-4f98-85dc-cc26fb1dbfe4 ro quiet splash vt.handoff=1
  RelatedPackageVersions:
   linux-restricted-modules-5.0.0-25-generic N/A
   linux-backports-modules-5.0.0-25-generic  N/A
   linux-firmware                            1.178.3
  SourcePackage: linux
  UpgradeStatus: Upgraded to disco on 2019-05-01 (112 days ago)
  dmi.bios.date: 06/26/2019
  dmi.bios.vendor: LENOVO
  dmi.bios.version: N1EET85W (1.58 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20ENCTO1WW
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0J40709 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: 
dmi:bvnLENOVO:bvrN1EET85W(1.58):bd06/26/2019:svnLENOVO:pn20ENCTO1WW:pvrThinkPadP50:rvnLENOVO:rn20ENCTO1WW:rvrSDK0J40709WIN:cvnLENOVO:ct10:cvrNone:
  dmi.product.family: ThinkPad P50
  dmi.product.name: 20ENCTO1WW
  dmi.product.sku: LENOVO_MT_20EN_BU_Think_FM_ThinkPad P50
  dmi.product.version: ThinkPad P50
  dmi.sys.vendor: LENOVO

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