I haven't try @AaronMa tip (comment #5). However, with kernel
4.15.0-46-generic I haven't noticed the reported problem.

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  T480: closed lid and touchpad

Status in linux package in Ubuntu:

Bug description:
  After closing the lid and working with externals screens and mouse and
  keyboard, the mouse cursor jumps. The effect is caused by touchpad:
  the workaround is to completely disable it in settings.

  This bug is 4.15.0-44 kernel specific. With the previous version 4.15.0-43 
the problem was not observed.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: linux-image-4.15.0-44-generic 4.15.0-44.47
  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:  afiergol   9976 F.... pulseaudio
   /dev/snd/pcmC0D0p:   afiergol   9976 F...m pulseaudio
   /dev/snd/controlC0:  afiergol   9976 F.... pulseaudio
  CurrentDesktop: GNOME
  Date: Wed Jan 30 17:29:35 2019
  HibernationDevice: RESUME=UUID=7b4a9d17-f6d7-42ed-8f12-34f46c41cc6c
  InstallationDate: Installed on 2018-04-05 (300 days ago)
  InstallationMedia: Ubuntu 16.04.4 LTS "Xenial Xerus" - Release amd64 
  MachineType: LENOVO 20L6S04200
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-43-generic 
root=/dev/mapper/ubuntu--vg-root ro quiet splash nogpumanager 
intel_iommu=on,igfx_off iommu=pt kvm.ignore_msrs=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: Upgraded to bionic on 2018-08-22 (161 days ago)
  dmi.bios.date: 11/07/2018
  dmi.bios.vendor: LENOVO
  dmi.bios.version: N24ET44W (1.19 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20L6S04200
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Defined
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.product.family: ThinkPad T480
  dmi.product.name: 20L6S04200
  dmi.product.version: ThinkPad T480
  dmi.sys.vendor: LENOVO

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