Public bug reported:
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
** Affects: pulseaudio (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1004607
Title:
pulseaudio switches microhpones randomly
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