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[Christof Buchbender <1566302@xxxxxxxxxxxxxxxxxx>]

I am affected by this bug as well. I have a Samsung Ativ book 8 with Ati/Intel hybrid graphics.
The workaround by peterriesde works for me (Thanks for that!). Thus turning off the ATI part allows to suspend with the official kernel. 

In my opinion this should be fixed urgently. My laptop got very hot in
it sleeve in my backpack several times, when I forgot to that suspend
did not work and did not shut it down normally.

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https://bugs.launchpad.net/bugs/1566302

Title:
  Ubuntu 16.04: Suspend freezes the system after upgrade to linux image
  4.4.0-16

Status in linux package in Ubuntu:
  Won't Fix

Bug description:
  I'm using ubuntu 16.04 on a XPS 15 9550.

  Suspend/resume worked flawlessly with linux image 4.4.0-15, and after
  standard upgrade yesterday (5/04/2016) which installed image 4.4.0-16,
  the system freezes when attempting a suspend. I get  no response from
  the system (nor keyboard, nor screen, nor touchpad), but it gets very
  hot, so that it must be running something.

  Booting with 4.4.0-15 makes the suspend to work perfectly.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-extra-4.4.0-16-generic 4.4.0-16.32
  ProcVersionSignature: Ubuntu 4.4.0-15.31-generic 4.4.6
  Uname: Linux 4.4.0-15-generic x86_64
  ApportVersion: 2.20.1-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  macias     1770 F.... pulseaudio
  CurrentDesktop: X-Cinnamon
  Date: Tue Apr  5 14:56:17 2016
  HibernationDevice: RESUME=UUID=4180adfa-3852-4a96-86b4-f3696448c743
  InstallationDate: Installed on 2016-03-07 (28 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160304)
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 003: ID 04f3:21d5 Elan Microelectronics Corp. 
   Bus 001 Device 002: ID 0a5c:6410 Broadcom Corp. 
   Bus 001 Device 004: ID 1bcf:2b95 Sunplus Innovation Technology Inc. 
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: Dell Inc. XPS 15 9550
  ProcEnviron:
   LANGUAGE=es_ES
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=es_ES.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-15-generic.efi.signed root=UUID=673f4658-75f8-4c01-bcd8-0af860269699 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-15-generic N/A
   linux-backports-modules-4.4.0-15-generic  N/A
   linux-firmware                            1.157
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 01/25/2016
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 01.01.19
  dmi.board.name: 0N7TVV
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvr01.01.19:bd01/25/2016:svnDellInc.:pnXPS159550:pvr:rvnDellInc.:rn0N7TVV:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.name: XPS 15 9550
  dmi.sys.vendor: Dell Inc.

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