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[Jeroen van der Gun <jeroen@xxxxxxxxxx>]

I have similar experiences since I upgraded from Ubuntu 15.10 to 16.04.
I can no longer suspend or hibernate, the screen goes black but the PC
stays on, heating up and triggering the fan after a while.

When I run Ubuntu 16.04 with kernel 4.2.0-35-generic (which was still
installed) instead of kernel 4.4.0-21-generic, the problem does not
occur, so I've uninstalled 4.4.0-21-generic for now until there's a
better solution. I have no kernel versions in between available in my
package manager.

Ubuntu 16.04 xenial (x86-64)
Cinnamon 2.8.6
Kernel 4.4.0-21-generic
Processor AMD A8-5550M APU with Radeon(tm) HD Graphics x 2
7.0 GiB memory
315 GB hard disks
Advanced Micro Devices, Inc. [AMD/ATI] Richland [Radeon HD 8550G] (prog-if 00 [VGA controller]) graphics card
No proprietary drivers in use
For completeness: unlike suspend, hibernate has never worked perfectly (screen would stay black after resume, workaround to wake up screen was suspend and resume from suspend)

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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:
  Incomplete

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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