I was on Ubuntu 15.10 for a long time and I did not have any issues. A
week ago I updated to Ubuntu 16.04 and the dialog started appearing
every time I plug in the same earphones I was using for more than 2
years now. Very annoying.

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  "Unknown audio device" dialog pops up every time I plug in headphones

Status in unity-settings-daemon package in Ubuntu:

Bug description:
  I've got a combined headphone/headset socket on my Laptop. Every time
  I plug in my headphones, an "unknown audio device" dialog pops up
  asking whether I've plugged in headphones or a headset.  This is isn't
  a great user experience as my phone can auto-detect the device.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu4
  ProcVersionSignature: Ubuntu 3.13.0-19.39-generic 3.13.6
  Uname: Linux 3.13.0-19-generic x86_64
  ApportVersion: 2.13.3-0ubuntu1
  Architecture: amd64
   /dev/snd/controlC1:  mark       1949 F.... pulseaudio
   /dev/snd/controlC0:  mark       1949 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Wed Mar 26 11:03:29 2014
  InstallationDate: Installed on 2014-03-24 (2 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140323)
  PackageArchitecture: all
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_AlsaPlaybackTest: ALSA playback test through plughw:PCH successful
  Symptom_Card: Built-in Audio - HDA Intel PCH
  Symptom_Jack: Green Headphone Out, Front
  Symptom_PulsePlaybackTest: PulseAudio playback test successful
  Symptom_Type: None of the above
  Title: [Latitude E7440, Realtek ALC292, Green Headphone Out, Front] Playback 
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 02/18/2014
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A08
  dmi.board.asset.tag: DE004505
  dmi.board.name: 07F3F4
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.asset.tag: DE004505
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.product.name: Latitude E7440
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.

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