I'm having the same issue on Mint 19.3.

Just installed mint a couple days ago.

Laptop is docked with 1 external monitor attached. The laptop screen
goes black for a few seconds at a time. External monitor stays active,
and I can use the external monitor as usual during the blackout. The
black laptop screen come back to life on its own, and all is back to

Happens every few hours.

Here's inxi:

$ inxi -Fxz
System:    Host: hp840 Kernel: 5.3.0-42-generic x86_64 bits: 64 compiler: gcc 
v: 7.4.0 Desktop: Cinnamon 4.4.8 
           Distro: Linux Mint 19.3 Tricia base: Ubuntu 18.04 bionic 
Machine:   Type: Laptop System: Hewlett-Packard product: HP EliteBook 840 G1 v: 
A3009DD10303 serial: <filter> 
           Mobo: Hewlett-Packard model: 198F v: KBC Version 15.59 serial: 
<filter> BIOS: Hewlett-Packard v: L71 Ver. 01.44 
           date: 04/12/2018 
Battery:   ID-1: BAT0 charge: 40.9 Wh condition: 41.2/41.2 Wh (100%) model: 
Hewlett-Packard Primary status: Unknown 
CPU:       Topology: Dual Core model: Intel Core i7-4600U bits: 64 type: MT MCP 
arch: Haswell rev: 1 L2 cache: 4096 KiB 
           flags: lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 
           Speed: 898 MHz min/max: 800/3300 MHz Core speeds (MHz): 1: 2252 2: 
2779 3: 1354 4: 2266 
Graphics:  Device-1: Intel Haswell-ULT Integrated Graphics vendor: 
Hewlett-Packard driver: i915 v: kernel bus ID: 00:02.0 
           Display: x11 server: X.Org 1.20.5 driver: modesetting unloaded: 
           resolution: 1600x900~60Hz, 1920x1080~60Hz 
           OpenGL: renderer: Mesa DRI Intel Haswell Mobile v: 4.5 Mesa 19.2.8 
direct render: Yes 
Audio:     Device-1: Intel Haswell-ULT HD Audio vendor: Hewlett-Packard driver: 
snd_hda_intel v: kernel bus ID: 00:03.0 
           Device-2: Intel 8 Series HD Audio vendor: Hewlett-Packard driver: 
snd_hda_intel v: kernel bus ID: 00:1b.0 
           Device-3: Audio-Technica type: USB driver: 
hid-generic,snd-usb-audio,usbhid bus ID: 2- 
           Sound Server: ALSA v: k5.3.0-42-generic 
Network:   Device-1: Intel Ethernet I218-LM vendor: Hewlett-Packard driver: 
e1000e v: 3.2.6-k port: 3080 bus ID: 00:19.0 
           IF: enp0s25 state: up speed: 1000 Mbps duplex: full mac: <filter> 
           Device-2: Intel Wireless 7260 driver: iwlwifi v: kernel port: ef80 
bus ID: 02:00.0 
           IF: wlo1 state: down mac: <filter> 
Drives:    Local Storage: total: 223.57 GiB used: 91.40 GiB (40.9%) 
           ID-1: /dev/sda vendor: Intel model: SSDSC2BF240A4H size: 223.57 GiB 
Partition: ID-1: / size: 219.06 GiB used: 91.40 GiB (41.7%) fs: ext4 dev: 
Sensors:   System Temperatures: cpu: 43.0 C mobo: N/A 
           Fan Speeds (RPM): N/A 
Info:      Processes: 226 Uptime: 52m Memory: 15.54 GiB used: 2.85 GiB (18.3%) 
Init: systemd runlevel: 5 Compilers: gcc: 7.5.0 
           Shell: bash v: 4.4.20 inxi: 3.0.32

You received this bug notification because you are a member of Desktop
Packages, which is subscribed to xorg in Ubuntu.

  Intermittent black screen on HP EliteBook 840 G1

Status in xorg package in Ubuntu:

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 

  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 
  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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