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[Yuri Ribeiro Sucupira <yuri_sucupira@xxxxxxxxxxx>]

Other filed bugs reporting the same issue in other kernels:

1) Ubuntu 3.19.0-26.28-generic 3.19.8-ckt4 x86_64 + "i915" kernel
module:

 https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1488719

2) Ubuntu 3.19.0-30.34-generic 3.19.8-ckt6 x86_64 + "i915_bpo" kernel
module:

 https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1503541

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https://bugs.launchpad.net/bugs/1520040

Title:
  [drm:gen8_irq_handler [i915_bpo]] *ERROR* The master control interrupt
  lied (SDE)!

Status in linux-lts-vivid package in Ubuntu:
  New

Bug description:
  Device: notebook Dell Inspiron 5548

  Operating system: 64-bit XUbuntu Linux 14.04 LTS

  Processor: Intel Core i7-5500U

  Kernel: 3.19.0-33-generic #38~14.04.1-Ubuntu SMP x86_64

  Video: dual chip. These are the two display controllers:
  - Advanced Micro Devices, Inc. [AMD/ATI] Topaz XT [Radeon R7 M260] display controller 33000000Hz (requires kernel module / device driver "fglrx"); and
  - Intel Corporation Broadwell-U Integrated Graphics VGA compatible controller 33000000Hz (requires kernel module / device driver "i915").

  Problem: my notebook's operating system is switching to runlevel 0
  (power off) randomly, subtly and thus unexpectedly. And if I 'cat
  /var/log/kern.log |grep -i i915' I get a lot of "[drm:gen8_irq_handler
  [i915_bpo]] *ERROR* The master control interrupt lied (SDE)!"
  messages. I'm under the impression that either the kernel or the
  kernel module "i915_bpo" is buggy.

  My notebook's problem can't be related to overheating, because it's a
  brand-new notebook (~1 week old) and I've already monitored its
  temperature parameters: nothing abnormal is happening. Also, I'm using
  a cooling laptop base/pad.

  Other kernels I've tested, with which the same issue happens:
  - 3.19.0-18-generic (kernel module: i915_bpo)
  - 3.19.0-23-generic (kernel module: i915_bpo)
  - 3.19.0-28-generic (kernel module: i915_bpo)
  - 4.2.0-18-generic (kernel module: i915)

  Temporary workaround: I downgraded to kernel "3.13.0-36-generic",
  which isn't buggy with its "i915_bdw.ko" (version 3.0) kernel object
  (module). Full path for this module:
  /lib/modules/3.13.0-36-generic/kernel/ubuntu/i915/i915_bdw.ko


  Notes:
  - "bdw" stands for "Broadwell"
  - "bpo", I believe, stands for "backport"

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.19.0-33-generic 3.19.0-33.38~14.04.1
  ProcVersionSignature: Ubuntu 3.19.0-33.38~14.04.1-generic 3.19.8-ckt7
  Uname: Linux 3.19.0-33-generic x86_64
  NonfreeKernelModules: wl fglrx
  ApportVersion: 2.14.1-0ubuntu3.19
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Wed Nov 25 23:44:39 2015
  InstallationDate: Installed on 2015-11-03 (22 days ago)
  InstallationMedia: Xubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
  SourcePackage: linux-lts-vivid
  UpgradeStatus: No upgrade log present (probably fresh install)

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