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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

** Changed in: linux (Ubuntu)
   Importance: Critical => High

** Changed in: linux (Ubuntu)
       Status: Confirmed => Triaged

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https://bugs.launchpad.net/bugs/1488758

Title:
  GPU crash on NUC with i915

Status in linux package in Ubuntu:
  Triaged

Bug description:
  Setup:

  Intel NUC, i915 graphics, two monitors, one connected with
  miniHDMI->HDMI cable, second with miniDP->HDMI cable.

  Screen goes black, flickers back on, goes black again. Only resolution
  is to ssh into the machine and reboot.

  Before rebooting, I got lots of these (about 106k lines) in syslog:

  kernel: [404964.521324] [drm:hsw_unclaimed_reg_detect.isra.12 [i915]]
  *ERROR* Unclaimed register detected. Please use the i915.mmio_debug=1
  to debug this problem.[drm:hsw_unclaimed_reg_detect.isra.12 [i915]]
  *ERROR* Unclaimed register detected. Please use the i915.mmio_debug=1
  to debug this problem.

  ...then,

  kernel: [406333.381029] [drm] stuck on render ring
  kernel: [406333.381945] [drm] GPU HANG: ecode 8:0:0xf5dffffe, in Xorg [918], reason: Ring hung, action: reset
  kernel: [406333.381947] [drm] GPU hangs can indicate a bug anywhere in the entire gfx stack, including userspace.
  kernel: [406333.381947] [drm] Please file a _new_ bug report on bugs.freedesktop.org against DRI -> DRM/Intel
  kernel: [406333.381948] [drm] drm/i915 developers can then reassign to the right component if it's not a kernel issue.
  kernel: [406333.381949] [drm] The gpu crash dump is required to analyze gpu hangs, so please always attach it.
  kernel: [406333.381951] [drm] GPU crash dump saved to /sys/class/drm/card0/error
  kernel: [406333.389006] drm/i915: Resetting chip after gpu hang
  kernel: [406339.379515] [drm] stuck on render ring
  kernel: [406339.380430] [drm] GPU HANG: ecode 8:0:0x85dffffb, in webapp-containe [14994], reason: Ring hung, action: reset
  kernel: [406339.380583] drm/i915: Resetting chip after gpu hang
  kernel: [406417.336790] [drm] GPU HANG: ecode 8:0:0xf5dffffe, in Xorg [918], reason: Ring hung, action: reset
  kernel: [406417.343850] drm/i915: Resetting chip after gpu hang
  kernel: [407944.976072] [drm] GPU HANG: ecode 8:0:0xf5dffffe, in Xorg [918], reason: Ring hung, action: reset
  kernel: [407944.983106] drm/i915: Resetting chip after gpu hang
  kernel: [409258.618636] [drm] GPU HANG: ecode 8:0:0xf5dffffe, in Xorg [918], reason: Ring hung, action: reset
  kernel: [409258.625733] drm/i915: Resetting chip after gpu hang
  kernel: [409264.604180] [drm] stuck on render ring
  kernel: [409264.605059] [drm] GPU HANG: ecode 8:0:0xf5dffffe, in Xorg [918], reason: Ring hung, action: reset
  kernel: [409264.605153] [drm:i915_set_reset_status [i915]] *ERROR* gpu hanging too fast, banning!
  kernel: [409264.612163] drm/i915: Resetting chip after gpu hang

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: linux-image-3.19.0-26-generic 3.19.0-26.28
  ProcVersionSignature: Ubuntu 3.19.0-26.28-generic 3.19.8-ckt4
  Uname: Linux 3.19.0-26-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1.3
  Architecture: amd64
  Date: Wed Aug 26 12:31:15 2015
  InstallationDate: Installed on 2015-08-01 (24 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.19.0-26-generic.efi.signed root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
  SourcePackage: linux
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: No upgrade log present (probably fresh install)

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