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 normal. 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: 21550 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: fbdev,vesa 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: 2-1.2.4.4:11 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: /dev/sda1 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 Ubuntu Touch seeded packages, which is subscribed to xorg in Ubuntu. 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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1715749/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp