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[jippie <1402331@xxxxxxxxxxxxxxxxxx>]

Similar, probalby same problem here.

- I've been running Kubuntu 14.04 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.

Please advice.

** Attachment added: "dmesg and kern.log starting from lock up."
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1402331/+attachment/4398393/+files/dmesg

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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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