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[darkhawk <1488719@xxxxxxxxxxxxxxxxxx>]

I'm not sure, but sometimes you can cheat with your system.

Example:

1.) working with your dual monitor
2.) lock your desktop (windows key and l for example)
3.) you see both external monitors locked
4.) wait sometime and they go to power safe mode
5.) coming back, press a key and see that only one monitor is available...the other one is still in power safe mode
6.) press  STRG+ALT and 2 (or 3 or any other number with a terminal assigned)
7.) see a lot of drm:gen8_irq_handler  error messages
8.) wait a moment and the other monitor which was/is in power safe mode will power up and showing up the same errors
9.) now yo back to your graphical UI (most of times STRG+ALT + 7)
10.) you might see that both screens are working again in dual mode...

I did this now for a lot of times (because setting the display settings
up again sucks)

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
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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