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[Martin Vysny <vysny@xxxxxxx>]

Thank you very much for the information, and I apologize for not
noticing the old BIOS. I have updated BIOS to the newest one:

$ sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date
L77 Ver. 01.33
07/20/2015

I am not sure what causes this bug to reproduce, so I will wait for the bug to manifest on its own.
Thank you.

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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

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