Fixed the no sound headphone issue for my Dell XPS 9560 by running this
in the terminal:

alsactl restore

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to alsa-driver in Ubuntu.
https://bugs.launchpad.net/bugs/1583801

Title:
  No sound via headphones (headset) when Ubuntu boots with them plugged
  in

Status in alsa-driver package in Ubuntu:
  Confirmed

Bug description:
  The bug is twofold, first when computer boots if the headset
  (headphones with built-in mic, one audio jack) is plugged in, then
  there is no sound (via headphones or otherwise). If you plug
  headphones out and back in, then it usually works as expected.

  The second scenario is the same, except that plugging out and back in
  again doesn't help. In that case, I just restart the laptop, then plug
  them back in again and it works.

  In all cases, microphone works.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu5
  ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8
  Uname: Linux 4.4.0-22-generic x86_64
  NonfreeKernelModules: nvidia_drm nvidia_modeset nvidia
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  crunch     3248 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Thu May 19 22:13:20 2016
  InstallationDate: Installed on 2016-05-07 (12 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 
(20160420.1)
  PackageArchitecture: all
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_AlsaPlaybackTest: ALSA playback test through plughw:PCH failed
  Symptom_Card: Built-in Audio - HDA Intel PCH
  Symptom_DevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  crunch     3248 F.... pulseaudio
  Symptom_Jack: Black Headphone Out, Left
  Symptom_Type: No sound at all
  Title: [XPS 15 9550, Realtek ALC3266, Black Headphone Out, Left] No sound at 
all
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/07/2016
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 01.02.00
  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.:bvr01.02.00:bd04/07/2016:svnDellInc.:pnXPS159550:pvr:rvnDellInc.:rn0N7TVV:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.name: XPS 15 9550
  dmi.sys.vendor: Dell Inc.

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