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[Stefan Langeland <morphuspam@xxxxxxxxx>]

Getting this error as well on a Dell XPS-13 developer edition (ubuntu
14.04 LTE) with Kernel 4.3.0-rc2 from mainline[1].

Error occurs when I connect an external monitor on DisplayPort with
4k/60hz: Monitor flickers, turns black every five seconds and turns off
completely after two or three minutes.

Error message (constantly with dmesg)

[14142.692434] [drm:gen8_irq_handler [i915]] *ERROR* The master control interrupt lied (SDE)!
...

After changing resolution back to 1920x1080 everything works fine again without any error messages. 
Reproducable with stock kernel on ubuntu (3.13.0-37).

[1]: http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.3-rc2-unstable/

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https://bugs.launchpad.net/bugs/1488719

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

Status in Linux:
  Confirmed
Status in linux package in Ubuntu:
  Confirmed

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:

  https://bugs.freedesktop.org/show_bug.cgi?id=80896

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: linux-image-generic 3.19.0.26.25
  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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