Update done. I’ll keep an eye on this and report back if I encounter the
issue again (or do not encounter it for a longer time—being a sporadic
bug, it’s difficult to tell if it’s gone away for good).

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  Intermittent black screen on HP EliteBook 840 G1

Status in xorg package in Ubuntu:

Bug description:
  Occasionally, the internal laptop display goes black for a few
  seconds, then comes back to life. The external display stays on. It
  looks as if power management were kicking in by error but affecting
  only the internal display.

  When I’m working with the external display, I need to move the mouse
  into the area managed by the internal display to wake it up again;
  else it seems to remain black (though I haven’t tested that behavior

  Most tests with the external display were made with the port
  replicator and an external display plugged into one of the DP ports
  via a DP–DVI adapter. I cannot tell for sure what the behavior is with
  the external display plugged directly into the laptop.

  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.

  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 
  CompositorRunning: None
  CurrentDesktop: MATE
  DistUpgraded: Fresh install
  DistroCodename: xenial
  DistroRelease: Ubuntu 16.04
  DistroVariant: ubuntu
  EcryptfsInUse: Yes
  ExtraDebuggingInterest: Yes, if not too technical
   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.product.name: HP EliteBook 840 G1
  dmi.product.version: A3009DD10203
  dmi.sys.vendor: Hewlett-Packard
  version.compiz: compiz 1:
  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 
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 

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