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[Yuri Ribeiro Sucupira <yuri_sucupira@xxxxxxxxxxx>]

This bug also affects me. Well, now it doesn't anymore, because I've
downgraded my system kernel.

Device: notebook Dell Inspiron 5548

Operating system: 64-bit XUbuntu Linux 14.04

Processor: Intel Core i7-5500U

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: the message "[drm:gen8_irq_handler [i915_bpo]] *ERROR* The
master control interrupt lied (SDE)!" floods my dmesg, and from time to
time my system crashes and my computer powers off. If I 'cat
/var/log/kern.log |grep -i i915' i see a huge amount of messages exactly
like this one, hence I can only assume that the kernel module i915_bpo
is buggy (or these kernels are buggy while they interact with that
kernel module). My notebook is subtly powering off from time to time
(unrelated with overheat, I'm pretty sure 'coz I've already monitored
temperature parameters and also 'coz I'm using a cooling laptop
base/pad, besides the fact that my notebook is brand-new: only 1 week
old).

Kernels I've tested which have this issue:
- 3.19.0-18-generic
- 3.19.0-23-generic
- 3.19.0-28-generic
- 3.19.0-33-generic
- 4.2.0-18-generic

All of them have the same problem: the kernel module "i915.ko" (in
4.2.0-18-generic) and the kernel module "i915_bpo.ko" (in kernels
3.19.0-??-generic) randomly cause subtle system shutdown (halt /
poweroff) in my notebook.

Solution: 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"

IMO, this bug is pretty serious and is taking a lot of time to get
fixed: my notebook could get damaged if it kept subtly powering off
several times a day, on an everyday basis, like it was doing because of
this bug. Hence, my strong suggestion to those who are experiencing this
issue is to downgrade to a stable kernel version (I recommend kernel
3.13.0-36-generic).

If you don't want to downgrade your kernel: become root ('sudo su'),
then open '/etc/default/grub' for edition (e.g. 'gedit
/etc/default/grub'), then add the 'nomodeset' option to
"GRUB_CMDLINE_LINUX_DEFAULT=" (e.g.
GRUB_CMDLINE_LINUX_DEFAULT="nomodeset"), then save the file, exit the
text editor and, still as root, run the command 'update-grub && telinit
6'. Your GRUB will be updated and your system will be restarted. After
that you won't be able to see OpenGL graphics anymore (e.g. Xscreensaver
openGL screensavers won't load), but your system will stop subtly
powering off.

-- 
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:
  Fix Released
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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