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[chris pollock <1497627@xxxxxxxxxxxxxxxxxx>]

Video froze last night, 01/17/2016 21:06:30 after uptime of 14d 12h 40m
from the last video freeze. I was running kernel 3.19.0-42-generic
#48~14.04.1-Ubuntu SMP Fri Dec 18 10:24:49 UTC 2015 x86_64 x86_64 x86_64
GNU/Linux) at the time. This time the hangcheck error was noted in my
syslog

Jan 17 21:17:32 localhost kernel: [1255120.808035]
[drm:i915_hangcheck_elapsed [i915]] *ERROR* Hangcheck timer elapsed...
render ring idle

I did a reboot via SSH from my tablet and loaded the newest 3.19 kernel

3.19.0-43-generic #49~14.04.1-Ubuntu SMP Thu Dec 31 15:44:49 UTC 2015
x86_64 x86_64 x86_64 GNU/Linux

As usual during these freezes the mouse cursor would move but all other
actions are frozen. Could not switch to another desktop and so forth.

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https://bugs.launchpad.net/bugs/1497627

Title:
  Periodically video will freeze for no reason at all and no specific
  time between freezes.

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  What I expect to happen is the video to not freeze every so often.
  What happened is that the video froze. This has been going on for over a year. It doesn't matter if I have any applications open such as Evolution or Firefox. It could happen any time during the day when I'm working on the computer or during the night when it's the most idle. Once the video freezes the cursor can still be moved around the desktop however clicking on anything does not work. During this time all background process and cronjobs continue to run.

  ---
  ApportVersion: 2.14.1-0ubuntu3.13
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  chris      2095 F.... pulseaudio
  CurrentDesktop: GNOME
  DistroRelease: Ubuntu 14.04
  HibernationDevice: RESUME=UUID=bb329dc0-0642-4b6a-876a-12c2f02fb7f6
  InstallationDate: Installed on 2014-10-24 (332 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
  Package: linux (not installed)
  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-3.13.0-63-generic root=UUID=4254a7e9-429b-4f53-a08c-ae7ff839b98f ro drm.debug=0xe plymouth:debug
  ProcVersionSignature: Ubuntu 3.13.0-63.103-generic 3.13.11-ckt25
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-63-generic N/A
   linux-backports-modules-3.13.0-63-generic  N/A
   linux-firmware                             1.127.15
  RfKill:

  Tags:  trusty
  Uname: Linux 3.13.0-63-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 08/06/2013
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A15
  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.:bvrA15:bd08/06/2013:svnDellInc.:pnOptiPlex780:pvr:rvnDellInc.:rn0C27VV:rvrA01:cvnDellInc.:ct6:cvr:
  dmi.product.name: OptiPlex 780
  dmi.sys.vendor: Dell Inc.

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