Just had a look at my own settings: I have "Dim display when idle" unchecked in the AC power tab, checked in the Battery tab. I am still getting a dark screen every now and then, even though I mostly work on AC power.
-- 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
