I experienced this issue in Linux Mint 20.03 (Cinnamon) and in Debian
Buster (KDE) as well.

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https://bugs.launchpad.net/bugs/1715749

Title:
  Intermittent black screen on HP EliteBook 840 G1

Status in xorg package in Ubuntu:
  Confirmed

Bug description:
  Once every couple hours, the internal laptop display goes black for a
  few seconds.

  This was reproducible:
  + With the laptop connected to a port replicator and the external display 
connected into the port replicator DP port via DP-DVI adapter. The external 
display remains on during this time.
  + With the laptop not connected into a port replicator but connected to an 
external display. The external display remains on during this time.
  + With the laptop not connected to either a port replicator or an external 
display.

  The hard disk was originally installed with Ubuntu MATE 14.10 in a HP
  EliteBook 6930p, upgraded to 15.04, 15.10 and eventually 16.04 and
  finally moved to the EliteBook 840 G1. The problem started immediately
  after the drive move.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: xorg 1:7.7+13ubuntu3
  ProcVersionSignature: Ubuntu 4.4.0-93.116-generic 4.4.79
  Uname: Linux 4.4.0-93-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.10
  Architecture: amd64
  CurrentDesktop: MATE
  Date: Fri Sep  8 00:53:24 2017
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2014-12-09 (1002 days ago)
  InstallationMedia: Ubuntu MATE 14.10 "Utopic Unicorn" - amd64 (20141023)
  SourcePackage: xorg
  UpgradeStatus: No upgrade log present (probably fresh install)
  ---
  ApportVersion: 2.20.1-0ubuntu2.15
  Architecture: amd64
  CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: None
  CurrentDesktop: MATE
  DistUpgraded: Fresh install
  DistroCodename: xenial
  DistroRelease: Ubuntu 16.04
  DistroVariant: ubuntu
  EcryptfsInUse: Yes
  ExtraDebuggingInterest: Yes, if not too technical
  GraphicsCard:
   Intel Corporation Haswell-ULT Integrated Graphics Controller [8086:0a16] 
(rev 0b) (prog-if 00 [VGA controller])
     Subsystem: Hewlett-Packard Company Haswell-ULT Integrated Graphics 
Controller [103c:198f]
  InstallationDate: Installed on 2014-12-09 (1158 days ago)
  InstallationMedia: Ubuntu MATE 14.10 "Utopic Unicorn" - amd64 (20141023)
  MachineType: Hewlett-Packard HP EliteBook 840 G1
  Package: xorg 1:7.7+13ubuntu3
  PackageArchitecture: amd64
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-112-generic 
root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 4.4.0-112.135-generic 4.4.98
  Tags:  xenial ubuntu
  Uname: Linux 4.4.0-112-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dialout dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 05/23/2016
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: L71 Ver. 01.37
  dmi.board.name: 198F
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: KBC Version 15.59
  dmi.chassis.asset.tag: CNU407CM0V
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: 
dmi:bvnHewlett-Packard:bvrL71Ver.01.37:bd05/23/2016:svnHewlett-Packard:pnHPEliteBook840G1:pvrA3009DD10203:rvnHewlett-Packard:rn198F:rvrKBCVersion15.59:cvnHewlett-Packard:ct10:cvr:
  dmi.product.name: HP EliteBook 840 G1
  dmi.product.version: A3009DD10203
  dmi.sys.vendor: Hewlett-Packard
  version.compiz: compiz 1:0.9.12.2+16.04.20160823-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.83-1~16.04.1
  version.libgl1-mesa-dri: libgl1-mesa-dri 17.2.4-0ubuntu1~16.04.4
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 17.2.4-0ubuntu1~16.04.4
  version.xserver-xorg-core: xserver-xorg-core 2:1.18.4-0ubuntu0.7
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.0-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20160325-1ubuntu1.2
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:1.0.12-1build2

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