Hi Christopher,

Why did you ask to file a new bug to be made regarding to kernel?
I have reported a similar bug and it seems that at least one of the issues is 
quite throughly pinned down to that one that can be worked around with the 
cstate=1 or 2 for some others. Bay Trail and some successor platforms are 
affected. 
Wouldn't we prefer to keep things centralised?
Does Canonical have any contacts with intel to spearpoint this horrible bug?
I have seen thousands of users complaining and those are just the ones that do 
report.
So this is very likely to be related to:
https://bugzilla.kernel.org/show_bug.cgi?id=109051

The bisect of the kernel commit might to be :
https://bugs.freedesktop.org/show_bug.cgi?id=88012#c23

Somebody at least pitched it to intel and I replied:
https://communities.intel.com/thread/60984

Please do not ask many people to bisect kernels if it might already be
done, it's very daunting and there is no point for the people affected
by the bug, right?

Current work arounds are running a pre-3.17 kernel and use cstate=1 (this works 
for my Yoga 2 11 but affects battery life quite a lot):
http://askubuntu.com/questions/749349/how-to-set-intel-idle-max-cstate-1
or for some cstate=2. 

For anyone looking for more workarounds, checkout the
bugzilla.kernel.org bug, there are some more options.

And PLEASE, ANYONE having contacts with intel, alert them!
I am not sure if they are aware of this issue and I can't imagine they are not, 
but it would certainly help to try and put the pressure up.

Thanks, hope this helps.

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https://bugs.launchpad.net/bugs/1503731

Title:
  8086:0f31 Ubuntu 15.04-15.10 freezes totally

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Ever since I first installed 15.04 back in April/May on my new DELL
  Inspiron 3646 I have experienced frequent(daily/every-other-
  day)complete lockups(cannot even switch to console(Alt-F1,F2,etc.).

  I have determined that the issue is related to the 'i915' driver in
  relation to my GPU.

  I'm currently using intel-linux-graphics-
  installer_1.2.0-0intel1_amd64.deb from https://01.org/linuxgraphics
  with similar results (maybe a little better than the stock i915 stack
  in 15.04).

  WORKAROUND: Use kernel boot parameter:
  intel_idle.max_cstate=1

  I have gained _significant_ improvements in reliability / stability by
  using parameters in the i915 module:

  /etc/modprobe.d/i915.conf:
  options i915 semaphores=1

  and / or

  /etc/default/grub:
  GRUB_CMDLINE_LINUX_DEFAULT="quiet intel_pstate=disable"

  and / or
  /usr/share/X11/xorg.conf.d/20-intel.conf:

  Section "Device"
     Identifier "Intel Graphics"
     Driver "intel"
     Option "TearFree" "1"
  EndSection

  and / or
  Disable "Intel Virtualization Technologies" in the BIOS.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: xorg (not installed)
  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
  CompositorRunning: None
  Date: Wed Oct  7 09:32:47 2015
  DistUpgraded: Fresh install
  DistroCodename: vivid
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation Atom Processor Z36xxx/Z37xxx Series Graphics & Display 
[8086:0f31] (rev 0e) (prog-if 00 [VGA controller])
     Subsystem: Dell Device [1028:068d]
  InstallationDate: Installed on 2015-09-17 (19 days ago)
  InstallationMedia: Ubuntu-Server 15.04 "Vivid Vervet" - Release amd64 
(20150422)
  LightdmGreeterLog:
   ** (lightdm-gtk-greeter:1005): WARNING **: [PIDs] Failed to execute command: 
upstart

   ** (lightdm-gtk-greeter:1005): WARNING **: Failed to load user image: Failed 
to open file '/home/chris/.face': No such file or directory
  MachineType: Dell Inc. Inspiron 3646
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-30-generic.efi.signed 
root=UUID=ef22be35-6f79-4356-be42-2689d1de0378 ro quiet
  SourcePackage: xorg
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/17/2015
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A09
  dmi.board.name: 0V6D8J
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 3
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: A09
  dmi.modalias: 
dmi:bvnDellInc.:bvrA09:bd08/17/2015:svnDellInc.:pnInspiron3646:pvr:rvnDellInc.:rn0V6D8J:rvrA00:cvnDellInc.:ct3:cvrA09:
  dmi.product.name: Inspiron 3646
  dmi.sys.vendor: Dell Inc.
  version.compiz: compiz N/A
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.60-2
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.5.9-2ubuntu1~vivid2
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.5.9-2ubuntu1~vivid2
  version.xserver-xorg-core: xserver-xorg-core 2:1.17.1-0ubuntu3.1
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.0-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.5.0-1ubuntu2
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917-1~exp1ubuntu2.2
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:1.0.11-1ubuntu2build1
  xserver.bootTime: Tue Oct  6 20:05:51 2015
  xserver.configfile: default
  xserver.errors:

  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                                 990
   vendor                                     ACR
  xserver.version: 2:1.17.1-0ubuntu3.1

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