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

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  Intermittent black screen on HP EliteBook 840 G1

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