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[chris pollock <1402331@xxxxxxxxxxxxxxxxxx>]

Although I'm still working on digesting the 'kernel bisection' I have
noticed several things. Firstly I've had four 'lockups' since 17 Jan,
none of which contain the  [drm:i915_hangcheck_elapsed] *ERROR*
Hangcheck timer elapsed... render ring idle issue. Secondly since 14 Jan
when I went back from the 3.14* kernel build to 3.13.0-44-generic I've
been seeing quite often in my syslog:

kernel: [ 1326.412487] [drm:intel_crtc_cursor_set_obj] cursor off
kernel: [ 1326.412493] [drm:g4x_check_srwm] SR watermark: display plane 92, cursor 2
kernel: [ 1326.412495] [drm:g4x_check_srwm] display watermark is too large(92/63), disabling
kernel: [ 1326.412497] [drm:intel_set_memory_cxsr] memory self-refresh is disabled
kernel: [ 1326.412499] [drm:g4x_update_wm] Setting FIFO watermarks - A: plane=40, cursor=2, B: plane=2, cursor=2, SR: plane=0, cursor=0

I might add that though the system 'appears' to be 'locked up' it is
only the video that is locked, however the mouse cursor will continue to
move, if that makes any sense. The system continues to fetch and process
mail with fetchmail and procmail, SpamAssassin and ClamAv continue to
run as well as scripts I have to report spam and so forth. Whether this
change will make any difference in this bug report I'm not sure however
I will continue to work on the kernel bisection as requested.

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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.

  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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