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[Bug 1455785] Re: Display locks up - [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... render ring idle


** Attachment added: "Xorg.0.log"

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

Status in linux package in Ubuntu:

Bug description:
  I've been running Kubuntu 14.04.2 LTS for about a year with no problems. Problem started about 3 months ago or so.
  - 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.  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.
  - 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. When my box locks up, I usually run full patching before power cycle, some messages in log files may be caused by that.

  [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

  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
   /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)
   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
   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
   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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