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[johnnys <1402331@xxxxxxxxxxxxxxxxxx>]

I own a Dell Optiplex 760 from 2009 and I have the exact same problem on
Debian Jessie (running kernel 3.16.0-4-amd64).

I have been running BIOS version A04 (from 2009) and just upgraded to
the latest A16 BIOS version.

I can keep you informed if this fixes the ugly bug.

FYI, I did the following to upgrade the BIOS, took me around 5mins:

- copied an USB FreeDOS 1.1 image onto an empty USB drive. I used this one (don't forget to bunzip2):
  http://derek.chezmarcotte.ca/wp-content/uploads/2012/01/FreeDOS-1.1-USB-Boot.img.bz2
- copied the latest O760-A15.exe BIOS update file for my Dell 760 onto the thumbdrive
- booted into FreeDOS and ran the bios update

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https://bugs.launchpad.net/bugs/1402331

Title:
  System will periodically lockup with [drm:i915_hangcheck_elapsed]
  *ERROR* Hangcheck timer elapsed... render ring idle

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  I have noticed the lockups periodically since 09/13/2014. I can't
  remember what kernel version was in use then possibly kernel
  3.13.0-35-generic or -36. It has continued periodically through
  versions -39; -40 and now to -43.  The last time this has happened was
  today Dec 13 14:40:57 localhost kernel: [154858.820009]
  [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... render
  ring idle. At times when it locks up I will have a cursor on a black
  screen and will have to press the power button to restart other times
  it will lockup whenever I'm in an application such as Firefox or
  Evolution. At that time I can usually CTRL>ALT-F1 log in and run 'sudo
  reboot' to restart the system. The release information requested is:

  chris@localhost:~$ lsb_release -rd
  Description:	Ubuntu 14.04.1 LTS
  Release:	14.04

  I've also attached the version.log and lspci-vnvn.log to this report.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-43-generic 3.13.0-43.72
  ProcVersionSignature: Ubuntu 3.13.0-43.72-generic 3.13.11.11
  Uname: Linux 3.13.0-43-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.6
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  chris      2445 F.... pulseaudio
  CurrentDesktop: GNOME
  Date: Sat Dec 13 20:22:51 2014
  HibernationDevice: RESUME=UUID=bb329dc0-0642-4b6a-876a-12c2f02fb7f6
  InstallationDate: Installed on 2014-10-24 (50 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  IwConfig:
   eth0      no wireless extensions.
   
   lo        no wireless extensions.
  MachineType: Dell Inc. OptiPlex 780
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-43-generic root=UUID=4254a7e9-429b-4f53-a08c-ae7ff839b98f ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-43-generic N/A
   linux-backports-modules-3.13.0-43-generic  N/A
   linux-firmware                             1.127.10
  RfKill:
   
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 02/13/2010
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A03
  dmi.board.name: 0C27VV
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A01
  dmi.chassis.asset.tag: LE0006476
  dmi.chassis.type: 6
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA03:bd02/13/2010:svnDellInc.:pnOptiPlex780:pvr:rvnDellInc.:rn0C27VV:rvrA01:cvnDellInc.:ct6:cvr:
  dmi.product.name: OptiPlex 780
  dmi.sys.vendor: Dell Inc.

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