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[Janne Heikkinen <janne.m.heikkinen@xxxxxxxxx>]

What software did you use to watch videos when these hangs occurred?

I've now been able to hang 4.4rc8 with OpenGL 3.0 code that draws about
70 million triangles per second. I haven't been able to hang it with
streaming video from the web or playing MPEG4 (ripped dvd's) video with
VLC. And so far I haven't been able to hang 4.2.8 at all. And I've been
testing only kernels with "drm/i915: Agressive downclocking on Baytrail"
reversed, ie. no "intel_idle.max_cstate=1". I'm wondering if another
player and/or more demanding video (full HD) would made playback hang
for me.

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https://bugs.launchpad.net/bugs/1530557

Title:
  Random hard freezes under X on a laptop with Intel BayTrail processor
  (ASUS R752MA)

Status in linux package in Ubuntu:
  Triaged

Bug description:
  System freezes hard when working under X, sometimes after minutes,
  sometimes after hours. Usually, but not always, graphics-intensive
  applications like viewing videos will trigger the hangs after a while,
  but they can also (much more rarely) occur when e.g. only an xterm is
  opened and being worked in under Unity.

  The MagicSysReq keys are not functional any more once the hang has
  occurred, there is no information in the logs, and no crash dump can
  be obtained by using the soft or nmi watchdogs, panic_on_oops etc.

  I have tried the latest mainline kernel build from
  http://kernel.ubuntu.com/~kernel-ppa/mainline/?C=N;O=D , linux-
  image-4.4.0-040400rc7-generic_4.4.0-040400rc7.201512272230_amd64.deb
  (4.4-rc7), and the hangs still occur under the same circumstances.

  Some research has led me to
  https://bugzilla.kernel.org/show_bug.cgi?id=109051 , and I believe
  that it describes the exact problem I am experiencing.

  WORKAROUND: Use kernel parameter:
  intel_idle.max_cstate=1

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: linux-image-4.2.0-22-generic 4.2.0-22.27
  ProcVersionSignature: Ubuntu 4.2.0-22.27-generic 4.2.6
  Uname: Linux 4.2.0-22-generic x86_64
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  tmm        2184 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Sat Jan  2 16:56:51 2016
  HibernationDevice: RESUME=UUID=f079f6d2-d58a-474c-ae48-d903be124a02
  InstallationDate: Installed on 2015-10-21 (72 days ago)
  InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
  MachineType: ASUSTeK COMPUTER INC. X751MA
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-22-generic root=UUID=dbe91b1d-f01e-4f19-85eb-3877b67143ac ro quiet splash intel_idle.max_cstate=1 vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.2.0-22-generic N/A
   linux-backports-modules-4.2.0-22-generic  N/A
   linux-firmware                            1.149.3
  SourcePackage: linux
  UpgradeStatus: Upgraded to wily on 2015-10-23 (71 days ago)
  dmi.bios.date: 08/10/2015
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: X751MA.403
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: X751MA
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: ASUSTeK COMPUTER INC.
  dmi.chassis.version: 1.0
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrX751MA.403:bd08/10/2015:svnASUSTeKCOMPUTERINC.:pnX751MA:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnX751MA:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
  dmi.product.name: X751MA
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK COMPUTER INC.

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