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[Thomas Moestl <tmoestl@xxxxxxx>]

I am experiencing this bug as well, on the same hardware. I have tested the mainline builds, and can confirm that the bug
exists with linux-image-4.4.0-040400rc7-generic_4.4.0-040400rc7.201512272230_amd64 as well.

After some searching, it appears that this bug is known in upstream:
https://bugzilla.kernel.org/show_bug.cgi?id=109051

As such, it probably occurs on most machines with Intel BayTrail processors, and is so far unresolved in upstream,
to my knowledge.

As the bug report mentions, there is a workaround, namely to add "intel_idle.max_cstate=1" to the boot options
(using grub, add this to the GRUB_CMDLINE_LINUX_DEFAULT in /etc/default/grub, then run update-grub). This likely
comes at the cost of some increase in power consumption, but so far it seems to work for me. If I get any more
hangs even with this option, I will leave another comment.

** Bug watch added: Linux Kernel Bug Tracker #109051
   http://bugzilla.kernel.org/show_bug.cgi?id=109051

** Tags added: kernel-bug-exists-upsream kernel-bug-exists-
upstream-4.4-rc7

** Tags removed: kernel-bug-exists-upsream
** Tags added: kernel-bug-exists-upstream

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

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https://bugs.launchpad.net/bugs/1518566

Title:
  Ubuntu 15.10 freezing randomly

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Ubuntu 15.10 freezing randomly

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: linux-image-4.2.0-18-generic 4.2.0-18.22
  ProcVersionSignature: Ubuntu 4.2.0-18.22-generic 4.2.3
  Uname: Linux 4.2.0-18-generic x86_64
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  spyros     3013 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Sat Nov 21 16:15:04 2015
  HibernationDevice: RESUME=UUID=3fbc151c-b9b3-492c-a1f4-c598a0b080bb
  InstallationDate: Installed on 2015-09-23 (58 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 005: ID 04b4:0060 Cypress Semiconductor Corp. Wireless optical mouse
   Bus 001 Device 003: ID 05e3:0608 Genesys Logic, Inc. Hub
   Bus 001 Device 002: ID 0bda:57bc Realtek Semiconductor Corp. 
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: ASUSTeK COMPUTER INC. X751MA
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-18-generic root=UUID=59242a09-40d6-4231-b79b-543e0a88dbde ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.2.0-18-generic N/A
   linux-backports-modules-4.2.0-18-generic  N/A
   linux-firmware                            1.149.2
  SourcePackage: linux
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: Upgraded to wily on 2015-11-05 (15 days ago)
  dmi.bios.date: 01/26/2015
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: X751MA.208
  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.208:bd01/26/2015: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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