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[Serrie <1574612@xxxxxxxxxxxxxxxxxx>]

Thanks Christopher. I've tried to do this. These are my findings and I
am not sure what to do next as the results seem not what I expect.

As the issue seems to be triggered some time between 15 minutes and a few hours I used 1 workday of no issues as a good sign and to give that specific running version the needed okay. Because of this testing took some time.
- 4.6.0 -> OK
- 4.4.0 -> OK
- 4.3.0 -> OK
- 4.2.8-ckt8 -> GFX bugs.. UI works but only 1 display out of 3 and every thing is immense slow UI-wise.
  From animations to even typing. If I change to non-X the console speed seems okay.
  Printing lots of data in the console (like catting a log file) is slowish though.
- 4.2.8-ckt9 -> Same as 4.2.8-ckt8.
- 4.2.8-ckt7 -> Same as 4.2.8-ckt8.
- 4.2.8-ckt6 -> same as 4.2.8-ckt8.
- 4.2.8-ckt5 -> same as 4.2.8-ckt8. Ubuntu-4.2.0-35.40 seems to be based on this. Though I don't have the slowness UI-wise with the Ubuntu kernel?
- 4.2.8-ckt4 -> same as 4.2.8-ckt8.
- 4.2.8-ckt3 -> same as 4.2.8-ckt8.
- 4.2.6 -> same as 4.2.8-ckt8.

I didn't run the one-day-OK test on the kernels with GFX issues as it
didn't allow me to get some real work done in the mean time.

The Ubuntu kernel doesn't seem to have the
'i915.preliminary_hw_support=1' boot parameter which is needed pre 4.3.x
to support the new Intel Skylake (6th gen.) GPUs. The only thing I can
think of is that one of the Ubuntu patches done to kernels enables this
by default?

I retried the kernels with the GFX issues after I added the boot paramter:
- 4.2.8-ckt9 -> OK. Only 2 displays work (even though it does see the third display there is no signal).
  Some minor GFX issues (UI artifacts with some transitions). But stable otherwise.
- 4.2.8-ckt8 -> Same as 4.2.8-ckt9.
- 4.2.8-ckt6 -> Same as 4.2.8-ckt9.
- 4.2.8-ckt4 -> Same as 4.2.8-ckt9.
- 4.2.8-ckt3 -> Same as 4.2.8-ckt9.

So I cannot seem to get the same issues with the mainline kernel the
Ubuntu kernel is based on. Am I missing something, as I also cannot
fully use all my screens which is possible with the Ubuntu kernel.

Hope it's okay if I put it on Confirmed as I think you might need it to
get a trigger to look at this bug.

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1574612

Title:
  Random hangs

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  System hangs randomly. This mostly occurs anywhere between 15 minutes
  and a few hours after boot. Couldn't figure out the trigger. Happened
  while viewing YouTube, using Spotify switching to Eclipse etc. SSH
  still works, so I can get to the machine if the lockup occurs. That's
  how I submitted the bug. All screens freeze though, while audio keeps
  on working (like music from Spotify or sound from a YouTube video).
  The only thing that seems to keep working UI-wise is the mouse
  pointer.

  Had memtest running for half an hour without problems.

  The issue occurs multiple times a day. Issue doesn't seem to be
  triggered if I remove linux-image-4.2.0-35-generic and go back to
  linux-image-4.2.0-16-generic. Did use the linux-image-4.2.0-16-generic
  kernel for a few days without issues.

  The kern.log contains some stacktraces with the method being
  'schedule'. This is around the time the hang occurs.

  See extra debug information for more info.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: linux-image-4.2.0-35-generic 4.2.0-35.40
  ProcVersionSignature: Ubuntu 4.2.0-35.40-generic 4.2.8-ckt5
  Uname: Linux 4.2.0-35-generic x86_64
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  serrie     1815 F.... pulseaudio
   /dev/snd/pcmC0D0c:   serrie     1815 F...m pulseaudio
   /dev/snd/controlC0:  serrie     1815 F.... pulseaudio
  Date: Mon Apr 25 13:56:48 2016
  InstallationDate: Installed on 2016-04-12 (13 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  IwConfig:
   docker0   no wireless extensions.
   
   enp4s0    no wireless extensions.
   
   lo        no wireless extensions.
  MachineType: System manufacturer System Product Name
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-35-generic root=UUID=c15a8aa0-fb21-495c-bbc6-ea4f2018dc1f ro quiet splash vt.handoff=7
  PulseList:
   Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied
   No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-4.2.0-35-generic N/A
   linux-backports-modules-4.2.0-35-generic  N/A
   linux-firmware                            1.149.3
  RfKill:
   
  SourcePackage: linux
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: Upgraded to wily on 2016-04-22 (3 days ago)
  dmi.bios.date: 01/27/2016
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 0505
  dmi.board.asset.tag: Default string
  dmi.board.name: B150M-A D3
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: Rev X.0x
  dmi.chassis.asset.tag: Default string
  dmi.chassis.type: 3
  dmi.chassis.vendor: Default string
  dmi.chassis.version: Default string
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0505:bd01/27/2016:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnB150M-AD3:rvrRevX.0x:cvnDefaultstring:ct3:cvrDefaultstring:
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer

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