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[jippie <1455785@xxxxxxxxxxxxxxxxxx>]

I disabled desktop effects for the moment, because some articles on
Internet point in that direction and also the lock up clearly happened
during the fading effect from one window to the other, as described
above.

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https://bugs.launchpad.net/bugs/1455785

Title:
  Display locks up - [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck
  timer elapsed... render ring idle

Status in linux package in Ubuntu:
  New

Bug description:
  Similar to
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1402331, probalby
  same problem here. Christopher M. Penalver asked me to register a new
  report. Unfortunately rebooted the system just before I saw
  Christopher's request. Hope the log files etc. are useful.

  - I've been running Kubuntu 14.04.2 LTS  for about a year with no problems. Problem started about 3 months ago or so, not entirely sure about the period.
  - The screen usually locks up when using Firefox, today it happen when I switched windows from Firefox to Konsole (the GUI app).  The screen locked half way switching the window borders from blue to grey. (Could it be the screen candy thingy that also does the wobbly windows, what's the name again?). The konsole window border on my right monitor is was grey, is now locked faint blue and should have turned to full blue. The Firefox window on the left monitor was full blue, is now slightly going to grey and locked right there and then.
  - I don't use a Dell computer, but some Intel mother board based system (DG43GT with a Q9550).
  - When the system is locked, which happens every two or three weeks, I can sometimes change to text console but not always. Currently I cannot access console, but I can log in to the box through SSH.
  - Screen blanking (power save) doesn't work when the screen locked.

  Linux diablo 3.13.0-49-generic #83-Ubuntu SMP Fri Apr 10 20:11:33 UTC
  2015 x86_64 x86_64 x86_64 GNU/Linux

  When my box locks up, I usually run full patching before power cycle,
  some messages in log files may be caused by that. I attached log files
  and I believe in the past I have some debug headers installed on my
  system which seems to list somewhat useful information.

  [vr mei 15 23:12:46 2015] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... render ring idle
  [vr mei 15 23:15:36 2015] INFO: task Xorg:2243 blocked for more than 120 seconds.
  [vr mei 15 23:15:36 2015]       Tainted: G           OX 3.13.0-49-generic #83-Ubuntu
  [vr mei 15 23:15:36 2015] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  [vr mei 15 23:15:36 2015] Xorg            D ffff88023bd134c0     0  2243   2230 0x00400000
  [vr mei 15 23:15:36 2015]  ffff8800b29d7a18 0000000000000086 ffff88022a6d1800 ffff8800b29d7fd8
  [vr mei 15 23:15:36 2015]  00000000000134c0 00000000000134c0 ffff88022a6d1800 ffff880035523000
  [vr mei 15 23:15:36 2015]  ffff880035472ad8 ffff880035eda800 ffff880035eda800 ffff8800032da780
  [vr mei 15 23:15:36 2015] Call Trace:
  [vr mei 15 23:15:36 2015]  [<ffffffff81725f49>] schedule+0x29/0x70
  [vr mei 15 23:15:36 2015]  [<ffffffffa015ea65>] intel_crtc_wait_for_pending_flips+0x75/0x110 [i915]
  [vr mei 15 23:15:36 2015]  [<ffffffff810ab120>] ? prepare_to_wait_event+0x100/0x100
  [vr mei 15 23:15:36 2015]  [<ffffffffa017008f>] intel_crtc_set_config+0x7ef/0x9a0 [i915]
  [vr mei 15 23:15:36 2015]  [<ffffffffa0026eed>] drm_mode_set_config_internal+0x5d/0xe0 [drm]
  [vr mei 15 23:15:36 2015]  [<ffffffffa00a4561>] drm_fb_helper_set_par+0x71/0xf0 [drm_kms_helper]
  [vr mei 15 23:15:36 2015]  [<ffffffff813cd181>] fb_set_var+0x191/0x430
  [vr mei 15 23:15:36 2015]  [<ffffffff810a2f60>] ? update_curr+0x80/0x180
  [vr mei 15 23:15:36 2015]  [<ffffffff813da161>] fbcon_blank+0x1d1/0x2d0
  [vr mei 15 23:15:36 2015]  [<ffffffff81462d68>] do_unblank_screen+0xb8/0x1f0
  [vr mei 15 23:15:36 2015]  [<ffffffff81458aba>] complete_change_console+0x5a/0xe0
  [vr mei 15 23:15:36 2015]  [<ffffffff81459aea>] vt_ioctl+0xfaa/0x11c0
  [vr mei 15 23:15:36 2015]  [<ffffffff8144d4cd>] tty_ioctl+0x26d/0xbb0
  [vr mei 15 23:15:36 2015]  [<ffffffff811ffcd1>] ? fsnotify+0x241/0x320
  [vr mei 15 23:15:36 2015]  [<ffffffff811d1200>] do_vfs_ioctl+0x2e0/0x4c0
  [vr mei 15 23:15:36 2015]  [<ffffffff811c0521>] ? __sb_end_write+0x31/0x60
  [vr mei 15 23:15:36 2015]  [<ffffffff811d1461>] SyS_ioctl+0x81/0xa0
  [vr mei 15 23:15:36 2015]  [<ffffffff8173263d>] system_call_fastpath+0x1a/0x1f

  Some more details in the attached file. I tarred the current /var/log
  directory so content from other log files is available upon request.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-52-generic 3.13.0-52.86
  ProcVersionSignature: Ubuntu 3.13.0-52.86-generic 3.13.11-ckt18
  Uname: Linux 3.13.0-52-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.10
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  jhendrix   3776 F.... pulseaudio
  CurrentDesktop: KDE
  Date: Sat May 16 17:32:37 2015
  InstallationDate: Installed on 2013-08-13 (640 days ago)
  InstallationMedia: Kubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  IwConfig:
   eth0      no wireless extensions.
   
   lo        no wireless extensions.
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-52-generic root=/dev/mapper/vg_diablo-system ro quiet splash nomdmonddf nomdmonisw nomdmonddf nomdmonisw nomdmonddf nomdmonisw vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-52-generic N/A
   linux-backports-modules-3.13.0-52-generic  N/A
   linux-firmware                             1.127.11
  RfKill:
   0: hci0: Bluetooth
   	Soft blocked: no
   	Hard blocked: no
  SourcePackage: linux
  UpgradeStatus: Upgraded to trusty on 2014-04-26 (385 days ago)
  dmi.bios.date: 04/06/2010
  dmi.bios.vendor: Intel Corp.
  dmi.bios.version: GTG4310H.86A.0031.2010.0406.1752
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: DG43GT
  dmi.board.vendor: Intel Corporation
  dmi.board.version: AAE62768-301
  dmi.chassis.type: 3
  dmi.modalias: dmi:bvnIntelCorp.:bvrGTG4310H.86A.0031.2010.0406.1752:bd04/06/2010:svn:pn:pvr:rvnIntelCorporation:rnDG43GT:rvrAAE62768-301:cvn:ct3:cvr:

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