Martin Vysny, thank you for reporting this and helping make Ubuntu better. As per http://h20564.www2.hp.com/hpsc/swd/public/readIndex?sp4ts.oid=5405133&swLangOid=8&swEnvOid=4060 an update to your computer's buggy and outdated BIOS is available (1.33). If you update to this following https://help.ubuntu.com/community/BIOSUpdate does it change anything?
If it doesn't, could you please both specify what happened, and provide the output of the following terminal command: sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date For more on BIOS updates and linux, please see https://help.ubuntu.com/community/ReportingBugs#Bug_reporting_etiquette . Please note your current BIOS is already in the Bug Description, so posting this on the old BIOS would not be helpful. As well, you don't have to create a new bug report. Once the BIOS is updated, if the problem is still reproducible, and the information above is provided, then please mark this report Status New. Otherwise, please mark this as Invalid. Thank you for your understanding. ** Tags added: bios-outdated-1.33 ** Changed in: xorg (Ubuntu) Importance: Undecided => Low ** Changed in: xorg (Ubuntu) Status: New => Incomplete -- 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/1509355 Title: xorg crashes because of intel gpu driver Status in xorg package in Ubuntu: Incomplete Bug description: Suddenly and without any warning the screen became blank and lightdm rebooted. I have found these interesting lines in dmesg: [14137.598202] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder A [14137.598222] [drm:intel_pch_fifo_underrun_irq_handler [i915]] *ERROR* PCH transcoder A FIFO underrun [14137.608538] [drm:intel_set_cpu_fifo_underrun_reporting [i915]] *ERROR* uncleared fifo underrun on pipe B [14137.608552] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun [14245.095875] [drm:intel_pipe_update_end [i915]] *ERROR* Atomic update failure on pipe A (start=601133 end=601134) [14697.328451] hrtimer: interrupt took 381228 ns [14744.724686] [drm:intel_pipe_update_end [i915]] *ERROR* Atomic update failure on pipe B (start=36973 end=36974) [17123.949459] usb 1-2: USB disconnect, device number 9 [17794.824728] [drm:intel_dp_start_link_train [i915]] *ERROR* failed to enable link training [17794.830525] [drm:intel_dp_complete_link_train [i915]] *ERROR* failed to start channel equalization This *may* be related to screen switching (undocking/docking of the notebook with an external monitor attached), but I am not sure at all. ProblemType: Bug DistroRelease: Ubuntu 15.10 Package: xorg 1:7.7+7ubuntu4 ProcVersionSignature: Ubuntu 4.2.0-16.19-generic 4.2.3 Uname: Linux 4.2.0-16-generic x86_64 NonfreeKernelModules: wl .tmp.unity.support.test.0: ApportVersion: 2.19.1-0ubuntu3 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: Fri Oct 23 15:03:40 2015 DistUpgraded: 2015-10-23 09:58:52,432 DEBUG enabling apt cron job DistroCodename: wily DistroVariant: ubuntu DkmsStatus: bcmwl, 6.30.223.248+bdcom, 3.19.0-31-generic, x86_64: installed bcmwl, 6.30.223.248+bdcom, 4.2.0-16-generic, x86_64: installed virtualbox, 5.0.4, 3.19.0-31-generic, x86_64: installed virtualbox, 5.0.4, 4.2.0-16-generic, x86_64: installed ExtraDebuggingInterest: Yes, if not too technical GraphicsCard: Intel Corporation 4th Gen Core Processor Integrated Graphics Controller [8086:0416] (rev 06) (prog-if 00 [VGA controller]) Subsystem: Hewlett-Packard Company Device [103c:1993] InstallationDate: Installed on 2015-04-02 (203 days ago) InstallationMedia: Ubuntu-Server 14.10 "Utopic Unicorn" - Release amd64 (20141022.2) MachineType: Hewlett-Packard HP ProBook 640 G1 ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.2.0-16-generic root=/dev/mapper/vg--root-lv--root ro quiet splash vt.handoff=7 SourcePackage: xorg UpgradeStatus: Upgraded to wily on 2015-10-23 (0 days ago) dmi.bios.date: 09/03/2014 dmi.bios.vendor: Hewlett-Packard dmi.bios.version: L77 Ver. 01.21 dmi.board.name: 1993 dmi.board.vendor: Hewlett-Packard dmi.board.version: KBC Version 16.39 dmi.chassis.asset.tag: 5CG4454VRQ dmi.chassis.type: 10 dmi.chassis.vendor: Hewlett-Packard dmi.modalias: dmi:bvnHewlett-Packard:bvrL77Ver.01.21:bd09/03/2014:svnHewlett-Packard:pnHPProBook640G1:pvrA3009DD10303:rvnHewlett-Packard:rn1993:rvrKBCVersion16.39:cvnHewlett-Packard:ct10:cvr: dmi.product.name: HP ProBook 640 G1 dmi.product.version: A3009DD10303 dmi.sys.vendor: Hewlett-Packard version.compiz: compiz 1:0.9.12.2+15.10.20151015-0ubuntu1 version.ia32-libs: ia32-libs N/A version.libdrm2: libdrm2 2.4.64-1 version.libgl1-mesa-dri: libgl1-mesa-dri 11.0.2-1ubuntu4 version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A version.libgl1-mesa-glx: libgl1-mesa-glx 11.0.2-1ubuntu4 version.xserver-xorg-core: xserver-xorg-core 2:1.17.2-1ubuntu9 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.2-1ubuntu1 version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.5.0+git20150819-0ubuntu1 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20150808-0ubuntu4 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu3 xserver.bootTime: Fri Oct 23 14:55:44 2015 xserver.configfile: default xserver.errors: xserver.logfile: /var/log/Xorg.0.log xserver.outputs: product id 4669 vendor AUO xserver.version: 2:1.17.2-1ubuntu9 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1509355/+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