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[Launchpad Bug Tracker <1161088@xxxxxxxxxxxxxxxxxx>]

[Expired for linux (Ubuntu) because there has been no activity for 60
days.]

** Changed in: linux (Ubuntu)
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1161088

Title:
  Computer freezes shortly (GUI) and sometimes freezes completely

Status in “linux” package in Ubuntu:
  Expired

Bug description:
  I am using Ubuntu 12.04 x86_64 on a Dell Latitude E6520 with Intel
  Sandy Bridge CPU/GPU (no additional GPU).

  The issue was not present on 11.10 and it started appearing only a few days ago on 12.04.
  So, until a few days ago,  Ubuntu 12.04 was fine as well.

  The computer freezes (Unity GUI) for a few seconds, no reaction to any
  keyboard input, the cursor still moves, but no reaction on any mouse
  buttons. Most of the time, the system recovers and continues to work
  as before, sometimes it did freeze completely and required a "hard
  reboot" (power off and on again).

  If the system recovers, the following dmesg entries can be observed:
  [..]
  [ 4351.356564] [drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU hung
  [ 4351.356573] [drm] capturing error event; look for more information in /debug/dri/0/i915_error_state
  [ 4351.365648] [drm] Enabling RC6 states: RC6 on, RC6p off, RC6pp off
  [ 4357.514587] [drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU hung
  [ 4357.514815] [drm] Enabling RC6 states: RC6 on, RC6p off, RC6pp off
  [ 4647.526356] [drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU hung
  [ 4647.526600] [drm] Enabling RC6 states: RC6 on, RC6p off, RC6pp off
  [ 4673.674039] [drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU hung
  [ 4673.674289] [drm] Enabling RC6 states: RC6 on, RC6p off, RC6pp off
  [..]

  Also, in case the system recovers, apport (GUI) pops up multiple
  times, but never opens a browser window to actually file the bug.
  Using apport-cli did work.

  Regards, Linus

  -8<-----------
  $ lsb_release -rd
  Description:	Ubuntu 12.04.2 LTS
  Release:	12.04
  -8<-----------
  $ uname -a
  Linux rhenium 3.5.0-26-generic #42~precise1-Ubuntu SMP Mon Mar 11 22:17:58 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
  -8<-----------
  $ apt-cache policy xserver-xorg-video-intel-lts-quantal
  xserver-xorg-video-intel-lts-quantal:
    Installed: 2:2.20.9-0ubuntu2~precise2
    Candidate: 2:2.20.9-0ubuntu2~precise2
    Version table:
   *** 2:2.20.9-0ubuntu2~precise2 0
          500 http://de.archive.ubuntu.com/ubuntu/ precise-updates/main amd64 Packages
          100 /var/lib/dpkg/status
  -8<-----------

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: xserver-xorg-video-intel-lts-quantal 2:2.20.9-0ubuntu2~precise2
  ProcVersionSignature: Ubuntu 3.5.0-26.42~precise1-generic 3.5.7.6
  Uname: Linux 3.5.0-26-generic x86_64
  ApportVersion: 2.0.1-0ubuntu17.1
  Architecture: amd64
  Date: Wed Mar 27 20:45:37 2013
  InstallationMedia: Ubuntu 12.04.2 LTS "Precise Pangolin" - Release amd64 (20130214)
  MarkForUpload: True
  SourcePackage: xserver-xorg-video-intel-lts-quantal
  UpgradeStatus: No upgrade log present (probably fresh install)

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