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[chris pollock <1497627@xxxxxxxxxxxxxxxxxx>]

I am now able to replicate my video freeze by lowering and raising
windows at a fast pace. When doing this my screen will 'flicker' for an
instant and at times will continue to flicker. The flicker consists
actually of two areas on the screen. I've tried to capture a screen shot
when the continuous flicker is happening but as soon as I raise the
window for Gnome screen shot the flicker stops. Tonight when lowering
and raising windows at a fast pace the freeze occurred. Running

cat /sys/kernel/debug/dri/0/i915_swizzle_info outputted:

bit6 swizzle for X-tiling = none
bit6 swizzle for Y-tiling = none
DDC = 0x00200010
DDC2 = 0x00300030
C0DRB3 = 0x0030
C1DRB3 = 0x0010

Running cat /sys/class/drm/card0/error outputted:

no error state collected

The freeze occurred at 20:07:39 my syslog shows this for that time
period

Oct 14 20:07:32 localhost kernel: [171877.801126] [drm:drm_mode_addfb2] [FB:57]
Oct 14 20:07:32 localhost kernel: [171877.838608] [drm:drm_mode_addfb2] [FB:60]
Oct 14 20:07:32 localhost kernel: [171877.926645] [drm:drm_mode_addfb2] [FB:64]
Oct 14 20:07:32 localhost kernel: [171877.944068] [drm:drm_mode_addfb2] [FB:65]
Oct 14 20:07:32 localhost kernel: [171877.975866] [drm:drm_mode_addfb2] [FB:66]
Oct 14 20:07:32 localhost kernel: [171877.993399] [drm:drm_mode_addfb2] [FB:67]
Oct 14 20:07:33 localhost kernel: [171879.439826] [drm:drm_mode_addfb2] [FB:68]
Oct 14 20:07:33 localhost kernel: [171879.462886] [drm:drm_mode_addfb2] [FB:69]
Oct 14 20:07:33 localhost kernel: [171879.480867] [drm:drm_mode_addfb2] [FB:70]
Oct 14 20:07:36 localhost kernel: [171881.525273] [drm:drm_mode_addfb2] [FB:57]
Oct 14 20:07:36 localhost kernel: [171881.660074] [drm:drm_mode_addfb2] [FB:59]
Oct 14 20:07:36 localhost kernel: [171881.676724] [drm:drm_mode_addfb2] [FB:64]
Oct 14 20:07:36 localhost kernel: [171881.710189] [drm:drm_mode_addfb2] [FB:65]
Oct 14 20:07:36 localhost kernel: [171881.726965] [drm:drm_mode_addfb2] [FB:66]
Oct 14 20:07:36 localhost kernel: [171881.743498] [drm:drm_mode_addfb2] [FB:67]
Oct 14 20:07:36 localhost kernel: [171881.786167] [drm:drm_mode_addfb2] [FB:68]

The flicker also appears when switching between window applications such
as from window 1 Evolution to window 2 Firefox or any other window.

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Packages, which is subscribed to linux in Ubuntu.
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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