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[marcojovi <marcojovi@xxxxxxxxx>]

I experienced the same problem on Lubuntu 14.04 (automatic switching to
front mic, although no front mic connected). This workaround fixed the
problem for me as well.

Here some more thoughts:
- The problem occurred less often on my pc if I decreased the speaker volume (internal feedback from speaker to unconnected front mic?)
- If this is not strictly a bug (might depend on hardware) there should still be a GUI option (pavucontrol) to disable autoswitching without having to go through config files
- In pavucontrol you can enable "Set as fallback" for each input (in my case front and rear mic + line in), even though I disabled this for front mic it keeped switching back to this input (the flag would then be automatically set again). Is this a separate bug?

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https://bugs.launchpad.net/bugs/1004607

Title:
  pulseaudio switches microhpones randomly

Status in “pulseaudio” package in Ubuntu:
  Confirmed

Bug description:
  Problem
  =======

  During Skype calls, pulseaudio switches input to front microphone
  randomly. I need to manually switch back to rear mic every time that
  happens.

  Expected
  =======

     I select the rear microphone as input (pavucontrol) and it stays
  that way.

  
  Workaround
  ==========

  I disabled this module in /etc/pulse/default.pa:

      # load-module module-switch-on-port-available

  and then restarting pulseaudio obviously solves this.

  
  Ideal workaround
  ==============

  Disable port switching for (selected?) input devices in pavucontrol.

  Or at least somehow honor my selection, e.g. if the input is marked as
  a fallback device, it shouldn't switch.

  
  Possible cause 1
  =============

  After pulseaudio startup, pactl shows these lines:

      analog-input-microphone-front: Front Microphone (priority 8500, available: yes)
      analog-input-microphone-rear: Rear Microphone (priority 8200, available: no)

  Note: I don't use the front mic port at all.

  Possible cause 2
  =============
  My sound card or ports may be creating noise that triggers "jack activation" events

  
  Possible cause 3
  =============

  Bios, hardware related issues trigger jack activation events.

  
  Example of pulseaudio switching mics during Skype call:
  ============================================

  pulseaudio[32253]: [alsa-source] alsa-source.c: Calculated software volume: 0: 100% 1: 100% (accurate-enough=yes)
  pulseaudio[32253]: [alsa-source] alsa-source.c:                      in dB: 0: 0.00 dB 1: 0.00 dB
  pulseaudio[32253]: [alsa-source] source.c: Volume not changing
  pulseaudio[32253]: [pulseaudio] module-suspend-on-idle.c: Source alsa_input.pci-0000_00_07.0.analog-stereo becomes busy.
  pulseaudio[32253]: [alsa-sink] ratelimit.c: 723 events suppressed
  pulseaudio[32253]: [alsa-sink] flist.c: pulsecore/memblockq.c: list_items flist is full (don't worry)
  pulseaudio[32253]: last message repeated 10 times
  pulseaudio[32253]: [pulseaudio] module-alsa-card.c: Jack 'Front Mic Jack' is now unplugged
  pulseaudio[32253]: [pulseaudio] device-port.c: Setting port analog-input-microphone-front to status no
  pulseaudio[32253]: [pulseaudio] module-switch-on-port-available.c: finding port analog-input-microphone-front
  pulseaudio[32253]: [pulseaudio] module-alsa-card.c: Jack 'Front Mic Jack' is now plugged in
  pulseaudio[32253]: [pulseaudio] device-port.c: Setting port analog-input-microphone-front to status yes
  pulseaudio[32253]: [pulseaudio] module-switch-on-port-available.c: finding port analog-input-microphone-front
  pulseaudio[32253]: [alsa-source] alsa-mixer.c: Activating path analog-input-microphone-front
  pulseaudio[32253]: [alsa-source] alsa-mixer.c: Path analog-input-microphone-front (Front Microphone), direction=2, priority=85, probed=yes, supported=yes, has_mute=yes, has_volume=yes, has_dB=yes, min_volume=0, max_volume=3, min_dB=-16.5, max_dB=60
  pulseaudio[32253]: [alsa-source] alsa-mixer.c: Element Front Mic Boost, direction=2, switch=0, volume=1, volume_limit=-1, enumeration=0, required=0, required_any=4, required_absent=0, mask=0x3600000000f66, n_channels=2, override_map=yes
  pulseaudio[32253]: [alsa-source] alsa-mixer.c: Element Capture, direction=2, switch=1, volume=1, volume_limit=-1, enumeration=0, required=0, required_any=0, required_absent=0, mask=0x3600000000f66, n_channels=2, override_map=yes
  pulseaudio[32253]: [alsa-source] alsa-mixer.c: Element Input Source, direction=2, switch=0, vol

  
  Note the line:  module-alsa-card.c: Jack 'Front Mic Jack' is now unplugged
  and instantly afterwards: module-switch-on-port-available.c: finding port analog-input-microphone-front

  Sound card
  =========
      
      cat /proc/asound/card0/codec\#0|grep Codec
      Codec: Realtek ALC888

  
  Versions
  =======
  Ubuntu           12.04 LTS
  pulseaudio     1:1.1-0ubuntu1
  kernel             3.2.0-24-generic
  alsa-base        1.0.25+dfsg-0u

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