I'm on the XPS 9360
Ubuntu 16.04
BIOS 1.0.7

Suspending the laptop makes the headset detect for me but they
headphones still don't work and the speakers stop working after that
too, it doesn't matter what I select under 'sound'. It then seems to
need a reboot to get the speakers back again (although I'm not 100% on
that).

auto muting is disabled and I'm loading the snd-soc-rt286 in
/etc/modules (as I only get sound from the left speaker otherwise).

USB speaker works fine.
None of my microphones work.

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https://bugs.launchpad.net/bugs/1575078

Title:
  [XPS 15 9550, Realtek ALC3266] Headphone jack stops working after a
  while

Status in alsa-driver package in Ubuntu:
  Confirmed

Bug description:
  I'm experiencing a strange behavior with a headphone jack on my
  laptop.

  I have an external audio speaker connected to it. When I disconnect the 
speaker and reconnect it again it stops working.
  Even more, laptop audio stops working too. And after the reboot, I don't even 
see any of the audio devices.

  I've googled a lot and tried different fixes from forums with no luck.
  After a while, I've accidentally discovered that putting the laptop to
  the sleep mode and rebooting system after brings audio back to live.
  Even more, if speakers were attached during this sleep-reboot
  procedure, they are starting to work as well.

  However, after the next reboot speakers are not working again. And if
  I will plug them out and in - problem with completely missing audio
  returns.

  P.S. I'm using laptop-mode-tools package on my laptop. Recovery after
  hibernation made me believe that it's somehow related. But after
  uninstalling this package nothing really changed.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu5
  ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
  Uname: Linux 4.4.0-21-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/pcmC0D0p:   kop        3224 F...m pulseaudio
   /dev/snd/controlC0:  kop        3224 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Tue Apr 26 12:17:03 2016
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2016-04-22 (3 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 
(20160420.1)
  PackageArchitecture: all
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_Card: Встроенное аудио - HDA Intel PCH
  Symptom_Jack: Black Headphone Out, Left
  Symptom_Type: Sound works for a while, then breaks
  Title: [XPS 15 9550, Realtek ALC3266, Black Headphone Out, Left] fails after 
a while
  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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