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[V B <valentin.brasov@xxxxxxxxx>]

Indeed, today the system worked fine (no freezing) the whole day after
rolling back to kernel 3.19 first thing in the morning, while yesterday
afternoon with the 4.2 kernel my laptop froze at least 4 times.

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https://bugs.launchpad.net/bugs/1552333

Title:
  After upgrade to 4.2 kernel Ubuntu 14.04 LTS randomly freezes
  completely

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  I am not sure whether this is related to Xorg because of following:

  Today it happened a few times this complete freeze. Before today never
  happened. Today I did a normal system update in the morning, then a
  ditro upgrade which just upgraded a few unimportant packages, then the
  first freeze happened. Later I upgraded the kernel from 3.19.0 to
  4.2.0 and after that a few more freezes happened. I attached the apt
  log generated today and including the last update yesterday:
  apt_log_for_day_with_upgrade_to_kernel4.2.log. Each time this
  happened, before freeze I saw in the log something like:

     9492 Mar  2 14:00:08 my-ubunty kernel: [ 2514.659171] [drm] HPD
  interrupt storm detected on connector HDMI-A-1: switching from hotplug
  detection to polling

  And once or twice I saw right after that something like:

     9493 Mar  2 14:01:13 my-ubuntu compiz: pam_ecryptfs: seteuid error
  Then some binary content

  I also use disk encryption (the one from Ubuntu).

  Each time the freezing happened, the mouse and keyboard weer dead and
  the screen was frozen in whatever content was displaying at that
  point. So the only think I could do is to press the power button for 5
  seconds.

  I upgraded from 3.19 kernel (linux-generic-lts-vivid) as follows:
  $ sudo apt-get update
  $ sudo apt-get install linux-generic-lts-wily

  Thank you.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: xorg 1:7.7+1ubuntu8.1
  ProcVersionSignature: Ubuntu 4.2.0-30.36~14.04.1-generic 4.2.8-ckt3
  Uname: Linux 4.2.0-30-generic x86_64
  NonfreeKernelModules: wl
  .tmp.unity.support.test.0:

  ApportVersion: 2.14.1-0ubuntu3.19
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  CurrentDesktop: Unity
  Date: Wed Mar  2 16:35:13 2016
  DistUpgraded: Fresh install
  DistroCodename: trusty
  DistroVariant: ubuntu
  DkmsStatus:
   bcmwl, 6.30.223.248+bdcom, 3.19.0-51-generic, x86_64: installed
   bcmwl, 6.30.223.248+bdcom, 4.2.0-30-generic, x86_64: installed
  EcryptfsInUse: Yes
  GpuHangFrequency: Several times a day
  GpuHangReproducibility: Seems to happen randomly
  GpuHangStarted: Today
  GraphicsCard:
   Intel Corporation 4th Gen Core Processor Integrated Graphics Controller [8086:0416] (rev 06) (prog-if 00 [VGA controller])
     Subsystem: Dell Device [1028:05fe]
     Subsystem: Dell Device [1028:05fe]
  InstallationDate: Installed on 2015-09-28 (156 days ago)
  InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
  MachineType: Dell Inc. XPS 15 9530
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.2.0-30-generic root=/dev/mapper/ubuntu--vg-root ro cgroup_enable=memory swapaccount=1 quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  Title: Xorg freeze
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 10/15/2014
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A07
  dmi.board.name: XPS 15 9530
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A07
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: Not Specified
  dmi.modalias: dmi:bvnDellInc.:bvrA07:bd10/15/2014:svnDellInc.:pnXPS159530:pvrA07:rvnDellInc.:rnXPS159530:rvrA07:cvnDellInc.:ct8:cvrNotSpecified:
  dmi.product.name: XPS 15 9530
  dmi.product.version: A07
  dmi.sys.vendor: Dell Inc.
  version.compiz: compiz 1:0.9.11.3+14.04.20150313-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.64-1~ubuntu14.04.1
  version.libgl1-mesa-dri: libgl1-mesa-dri N/A
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx N/A
  version.xserver-xorg-core: xserver-xorg-core N/A
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati N/A
  version.xserver-xorg-video-intel: xserver-xorg-video-intel N/A
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau N/A
  xserver.bootTime: Wed Mar  2 16:15:49 2016
  xserver.configfile: default
  xserver.errors:
   Failed to load module "nvidia" (module does not exist, 0)
   Failed to load module "nvidia" (module does not exist, 0)
   NOUVEAU(G0): Failed to initialise context object: 2D_NVC0 (0)
   NOUVEAU(G0): Error initialising acceleration.  Falling back to NoAccel
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:

  xserver.version: 2:1.17.1-0ubuntu3.1~trusty1

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