Reported the bug to libinput developers.

Bug ID reference:

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  AlpsPS/2 ALPS GlidePoint vertical pointer speed is very low

Status in libinput package in Ubuntu:
Status in linux package in Ubuntu:

Bug description:
  While moving pointer (cursor) using Touchpad, vertical movement is
  very slow and short (= less velocity and less acceleration compared to
  horizontal axis). Horizontal movement is fine. So, when circle is
  drawn on the Touchpad, the pointer moves in oval shape.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: linux-image-4.15.0-43-generic 4.15.0-43.46
  ProcVersionSignature: Ubuntu 4.15.0-43.46-generic 4.15.18
  Uname: Linux 4.15.0-43-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.5
  Architecture: amd64
   /dev/snd/controlC1:  user       1168 F.... pulseaudio
   /dev/snd/controlC0:  user       1168 F.... pulseaudio
  CurrentDesktop: ubuntu:GNOME
  Date: Fri Jan 18 10:10:35 2019
  HibernationDevice: RESUME=UUID=5eb56af0-cec9-43d4-b84a-46d561cecb30
  InstallationDate: Installed on 2019-01-13 (4 days ago)
  InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 
  MachineType: LENOVO 80N4
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-43-generic 
root=UUID=a791b794-48c2-47fb-b2e6-11085529d9ba ro quiet splash vt.handoff=1
   linux-restricted-modules-4.15.0-43-generic N/A
   linux-backports-modules-4.15.0-43-generic  N/A
   linux-firmware                             1.173.3
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install) 08/03/2016
  dmi.bios.vendor: Lenovo
  dmi.bios.version: BDCN71WW
  dmi.board.asset.tag: No Asset Tag Lenovo Yoga 500-14IBD
  dmi.board.vendor: LENOVO
  dmi.board.version: 31900058 WIN
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Lenovo Yoga 500-14IBD
dmi:bvnLenovo:bvrBDCN71WW:bd08/03/2016:svnLENOVO:pn80N4:pvrLenovoYoga500-14IBD:rvnLENOVO:rnLenovoYoga500-14IBD:rvr31900058WIN:cvnLENOVO:ct10:cvrLenovoYoga500-14IBD: IDEAPAD 80N4
  dmi.product.version: Lenovo Yoga 500-14IBD
  dmi.sys.vendor: LENOVO

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