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[Bug 1503541] Re: kern.log flooded with "[drm:gen8_irq_handler [i915_bpo]] *ERROR* The master control interrupt lied (SDE)!"


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. 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. Also, my notebook was 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

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) cause subtle system shutdown (halt / poweroff) in my

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:

- "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 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

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="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.

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  kern.log flooded with "[drm:gen8_irq_handler [i915_bpo]] *ERROR* The
  master control interrupt lied (SDE)!"

Status in linux package in Ubuntu:

Bug description:
  On an intel i5 toshiba laptop on vivid. Upgraded to the
  3.19.0-30-generic kernel and started seeing this. Additionally, bootup
  was slow.

  kern.log/dmesg is flooded with this output

  [   69.070503] [drm:gen8_irq_handler [i915_bpo]] *ERROR* The master
  control interrupt lied (SDE)!

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: linux-image-3.19.0-30-generic 3.19.0-30.34
  ProcVersionSignature: Ubuntu 3.19.0-30.34-generic 3.19.8-ckt6
  Uname: Linux 3.19.0-30-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1.5
  Architecture: amd64
   /dev/snd/controlC0:  wolsen     2493 F.... pulseaudio
   /dev/snd/controlC1:  wolsen     2493 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Tue Oct  6 22:30:20 2015
  HibernationDevice: RESUME=UUID=096b9e95-621b-4cc7-a10c-250149e1b48b
  InstallationDate: Installed on 2015-07-15 (83 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  MachineType: TOSHIBA Satellite E45-B
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.19.0-30-generic.efi.signed root=/dev/mapper/ubuntu--vg-root ro noprompt quiet splash
   linux-restricted-modules-3.19.0-30-generic N/A
   linux-backports-modules-3.19.0-30-generic  N/A
   linux-firmware                             1.143.3
  SourcePackage: linux
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 01/12/2015
  dmi.bios.vendor: INSYDE Corp.
  dmi.bios.version: 1.10
  dmi.board.asset.tag: Type2 - Board Asset Tag
  dmi.board.name: CA10CU
  dmi.board.vendor: TOSHIBA
  dmi.board.version: 2.0
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: OEM Chassis ManuFacturer
  dmi.chassis.version: OEM Chassis Version
  dmi.modalias: dmi:bvnINSYDECorp.:bvr1.10:bd01/12/2015:svnTOSHIBA:pnSatelliteE45-B:pvrPSPNAU-001002:rvnTOSHIBA:rnCA10CU:rvr2.0:cvnOEMChassisManuFacturer:ct10:cvrOEMChassisVersion:
  dmi.product.name: Satellite E45-B
  dmi.product.version: PSPNAU-001002
  dmi.sys.vendor: TOSHIBA

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