I have updated the BIOS to the latest version. Here is the output of dmidecode:
M74 Ver. 01.16 11/26/2015 So far, I have not observed the problematic behaviour. I will mark the bug status as Invalid, as requested, and change it to Confirmed if the problem re-appears. Thank you. ** Changed in: linux (Ubuntu) Status: Incomplete => Invalid -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1532975 Title: Screen periodically goes black for a second Status in linux package in Ubuntu: Invalid Bug description: I am using Ubuntu 14.04.3 on a HP ProBook 430 G2/2246. It is often the case that my screen goes black for a second and then recovers. It is my impression that this only happens when the computer has been idle -- even for a very short time -- so I have disabled screen locking and dimming and I have also removed the gnome-screensaver package, yet the problem persists. I took a look at /var/log/syslog and discovered an identical set of error messages (dump traces, mainly) for every time this happens. I am attaching a file with this set of messages. ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: xorg 1:7.7+1ubuntu8.1 ProcVersionSignature: Ubuntu 3.16.0-57.77~14.04.1-generic 3.16.7-ckt20 Uname: Linux 3.16.0-57-generic x86_64 .tmp.unity.support.test.0: ApportVersion: 2.14.1-0ubuntu3.19 Architecture: amd64 CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins' CompositorRunning: compiz CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0' CompositorUnredirectFSW: true CurrentDesktop: Unity Date: Tue Jan 12 00:02:52 2016 DistUpgraded: Fresh install DistroCodename: trusty DistroVariant: ubuntu ExtraDebuggingInterest: Yes GraphicsCard: Intel Corporation Haswell-ULT Integrated Graphics Controller [8086:0a16] (rev 0b) (prog-if 00 [VGA controller]) Subsystem: Hewlett-Packard Company Device [103c:2246] InstallationDate: Installed on 2015-04-20 (266 days ago) InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1) MachineType: Hewlett-Packard HP ProBook 430 G2 ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-57-generic root=UUID=3a069045-f0b3-46ac-b25f-057beaa48b7e ro quiet splash vt.handoff=7 SourcePackage: xorg Symptom: display UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 08/16/2014 dmi.bios.vendor: Hewlett-Packard dmi.bios.version: M74 Ver. 01.04 dmi.board.name: 2246 dmi.board.vendor: Hewlett-Packard dmi.board.version: KBC Version 67.22 dmi.chassis.type: 10 dmi.chassis.vendor: Hewlett-Packard dmi.modalias: dmi:bvnHewlett-Packard:bvrM74Ver.01.04:bd08/16/2014:svnHewlett-Packard:pnHPProBook430G2:pvrA3008CD10003:rvnHewlett-Packard:rn2246:rvrKBCVersion67.22:cvnHewlett-Packard:ct10:cvr: dmi.product.name: HP ProBook 430 G2 dmi.product.version: A3008CD10003 dmi.sys.vendor: Hewlett-Packard version.compiz: compiz 1:0.9.12+14.10.20140812-0ubuntu1.01 version.ia32-libs: ia32-libs N/A version.libdrm2: libdrm2 2.4.60-2~ubuntu14.04.1 version.libgl1-mesa-dri: libgl1-mesa-dri N/A version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A version.libgl1-mesa-glx: libgl1-mesa-glx N/A version.xserver-xorg-core: xserver-xorg-core N/A version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A version.xserver-xorg-video-ati: xserver-xorg-video-ati N/A version.xserver-xorg-video-intel: xserver-xorg-video-intel N/A version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau N/A xserver.bootTime: Thu Dec 31 15:19:11 2015 xserver.configfile: default xserver.errors: xserver.logfile: /var/log/Xorg.0.log xserver.outputs: product id 14425 vendor SEC xserver.version: 2:1.16.0-1ubuntu1.2~trusty2 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1532975/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp