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[Terry Coles <1575467@xxxxxxxxxxxxxxxxxx>]

I appear to have the same problem with my Dell Optiplex desktop machine
and my Dell XPS 13 Developer Edition.  The XPS is brand new and has been
updated to the latest BIOS version.  The Optiplex has a somewhat aged
BIOS, but I've never seen any problems until now.

Both machines have been updated by doing a clean install of 16.04;
Kubuntu on this machine and Ubuntu on the XPS.

One thing that I've discovered is that the machine can be pinged when
it's down, but otherwise the symptoms are identical to those reported
above.  Entering coredumpctl returns 'No coredumps found'.

The problem has been observed when I am typing, moving the mouse,
reading text or simply doing nothing.

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https://bugs.launchpad.net/bugs/1575467

Title:
  Ubuntu 16.04 consistently freezes up / hangs

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  After upgrading from stock Ubuntu 14.04 to 16.04 my laptop
  consistently freezes up and is unresponsive to keyboard or mouse. The
  only way is to do a hard shutdown. I'm usually in a browser when this
  happens, and often watching a video or two. It seems to happen more
  often in Google Chrome than Firefox, but it happens with both. It has
  happened at least once with no videos loaded. I haven’t observed it
  freeze / hang when I’m not in a browser, but that's mainly what i use
  my laptop for, so that's where most of my time is spent.

  ---
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  andrew     1949 F.... pulseaudio
  DistroRelease: Ubuntu 16.04
  HibernationDevice: RESUME=UUID=e8aaee7c-d956-4519-94f0-cf7aad745020
  InstallationDate: Installed on 2015-08-08 (263 days ago)
  InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
  MachineType: Dell Inc. Inspiron 3451
  Package: linux (not installed)
  ProcEnviron:
   LANGUAGE=en_US
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-21-generic.efi.signed root=UUID=d01f07be-c906-4024-8eef-a58ba3935298 ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
  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-4.4.0-21-generic N/A
   linux-backports-modules-4.4.0-21-generic  N/A
   linux-firmware                            1.157
  Tags:  xenial
  Uname: Linux 4.4.0-21-generic x86_64
  UpgradeStatus: Upgraded to xenial on 2016-04-22 (4 days ago)
  UserGroups:

  _MarkForUpload: True
  dmi.bios.date: 12/05/2014
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A00
  dmi.board.name: 0H4MK6
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: Not Specified
  dmi.modalias: dmi:bvnDellInc.:bvrA00:bd12/05/2014:svnDellInc.:pnInspiron3451:pvrA00:rvnDellInc.:rn0H4MK6:rvrA00:cvnDellInc.:ct8:cvrNotSpecified:
  dmi.product.name: Inspiron 3451
  dmi.product.version: A00
  dmi.sys.vendor: Dell Inc.

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