As stated in comment #2:

As a first point of call you should return the laptop to where you
bought it, or contact HP Support about a warranty claim.

You received this bug notification because you are a member of Kernel
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  Vertical line screen flickers randomly appears on built-in laptop
  display only

Status in linux package in Ubuntu:

Bug description:
  The issue is similar to:

  the short video with the problem

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: xorg 1:7.7+19ubuntu7.1
  ProcVersionSignature: Ubuntu 4.15.0-47.50-generic 4.15.18
  Uname: Linux 4.15.0-47-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.6
  Architecture: amd64
  BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
  CompositorRunning: None
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Apr 11 22:42:06 2019
  DistUpgraded: Fresh install
  DistroCodename: bionic
  DistroVariant: ubuntu
   Intel Corporation UHD Graphics 620 [8086:5917] (rev 07) (prog-if 00 [VGA 
     Subsystem: Hewlett-Packard Company UHD Graphics 620 [103c:83b2]
  InstallationDate: Installed on 2018-12-03 (129 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
  MachineType: HP HP EliteBook 840 G5
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-47-generic 
root=UUID=4b3ca7ee-f7ef-4f10-ae37-d86fdeb64942 ro quiet splash vt.handoff=1
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install) 09/12/2018
  dmi.bios.vendor: HP
  dmi.bios.version: Q78 Ver. 01.04.00 83B2
  dmi.board.vendor: HP
  dmi.board.version: KBC Version 04.53.00
  dmi.chassis.asset.tag: F51020
  dmi.chassis.type: 10
  dmi.chassis.vendor: HP
dmi:bvnHP:bvrQ78Ver.01.04.00:bd09/12/2018:svnHP:pnHPEliteBook840G5:pvr:rvnHP:rn83B2:rvrKBCVersion04.53.00:cvnHP:ct10:cvr: 103C_5336AN HP EliteBook HP EliteBook 840 G5
  dmi.sys.vendor: HP
  version.compiz: compiz N/A
  version.libdrm2: libdrm2 2.4.95-1~18.04.1
  version.libgl1-mesa-dri: libgl1-mesa-dri 18.2.8-0ubuntu0~18.04.2
  version.libgl1-mesa-glx: libgl1-mesa-glx 18.2.8-0ubuntu0~18.04.2
  version.xserver-xorg-core: xserver-xorg-core 2:1.19.6-1ubuntu4.2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:18.0.1-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2

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