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[Bug 1488719] Re: dmesg shows "[drm:gen8_irq_handler [i915]] *ERROR* The master control interrupt lied (SDE)!"


I've just started getting this after updating to linux-
image-3.19.0-30-generic from linux-image-3.19.0-28-generic.

NUC 5i3RYH connected via the mini-hdmi port to a 720p tv.

100% repeatable for me using Kodi 15.1. If I play a video I get audio,
but the video is all black. If I activate the on-screen display items
they render fine, but the video content itself is missing. Audio is

Entering and exiting a video I get this each time:

[   29.275053] [drm:gen8_irq_handler [i915_bpo]] *ERROR* The master control interrupt lied (SDE)!
[   29.275763] [drm:gen8_irq_handler [i915_bpo]] *ERROR* The master control interrupt lied (SDE)!
[   29.316539] sound hdaudioC0D0: HDMI: ELD buf size is 0, force 128
[   29.316579] sound hdaudioC0D0: HDMI: invalid ELD data byte 0
[   29.348980] [drm:gen8_irq_handler [i915_bpo]] *ERROR* The master control interrupt lied (SDE)!
[   29.363813] [drm:gen8_irq_handler [i915_bpo]] *ERROR* The master control interrupt lied (SDE)!

Always the first six lines, sometimes more of the (SDE!) lines follow.
Always one set when playback begins, and another when playback ends.

Further to this, if I disable VAAPI acceleration in Kodi, the video
playback works again, but the kernel messages still appear.

Both the black-video and the messages are completely new in 3.19.0-30 -
haven't seen either in earlier kernels.

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  dmesg shows "[drm:gen8_irq_handler [i915]] *ERROR* The master control
  interrupt lied (SDE)!"

Status in Linux:
Status in linux package in Ubuntu:

Bug description:
  On a recent intel NUC using i915 graphics, I get the following errors
  in dmesg:

  [drm:gen8_irq_handler [i915]] *ERROR* The master control interrupt
  lied (SDE)!

  There are two monitors connected to this box, one with mini-
  HDMI->HDMI, one with mini-DP->HDMI cable.

  Maybe related:


  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: linux-image-generic
  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 10:07:31 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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