[pulseaudio-discuss] How to change which connected microphone to use.

Tanu Kaskinen tanuk at iki.fi
Tue Nov 7 11:15:39 UTC 2017

On Mon, 2017-11-06 at 16:56 -0700, inssrich at gmail.com wrote:
> Looking to accomplish the following:
> *        Change default microphone from analog mic to logitech 920C Webcam
> Mic (or back the other way) from the command line.
> *        would like to be able to do this using either/or/both the vendor
> ID, product id rather than the ugly long complicated device name. My
> scripting skills are rudimentary so this is lost on me.
> *        If that does not work, reset the USB connection to the camera so
> that it is rediscovered.
> Background
> I have a kiosk system that boots fresh every time and is configured from a
> config file on a web server. Currently I have two microphones connected to
> the kiosk; an analog mic into the microphone port and a logitech 920C with
> internal mic. Generally the internal mic comes up as the default. I can pass
> in commands from the config file and I would like the ability to choose
> which microphone is active after boot using this method. the system
> recognizes both microphones but the logitech does not seem to pass any sound
> into the system even after manipulating it in pavucontrol. The only way I've
> been able to make it work after a fresh boot is to disconnect it physically
> and reconnect it, at which point it functions as expected.
> What I've tried
> I've tried a number of methods to try and change the default microphone from
> analog to the logitech. The below code has worked in changing the default
> device but it made no change in the function of the microphone.
> $ pacmd "set-default-source device-name-of-logitech"
> And 
> $ pactl set-default-source 0
> I've also followed the procedure outlined in the canned answer section
> below. I chose the 4th option, which disabled the function of the analog mic
> but did not make the Logitech mic work as hoped.
> https://www.freedesktop.org/wiki/Software/PulseAudio/Documentation/User/Defa
> ultDevice/
> I can mute and unmute and change volume of the source with the below code
> but it has no effect on function
> $ pactl set-source-mute 0 1
> $ pactl set-source-volume 0 50%
> I've also tried to reset the usb device using the below code. When doing so
> the logitech will dissapear from pavucontrol and then reappear but still
> without any functional results to make the microphone send audio
> sudo sh -c "echo 0 > /sys/bus/usb/devices/1-4.6/authorized"
> sudo sh -c "echo 1 > /sys/bus/usb/devices/1-4.6/authorized"
> It seems like the only thing that works successfully and repeatedly is to
> physically disconnect/reconnect the camera from the computer. It's a bit of
> a hack but if I could reproduce that action from the command line I may be
> able to get it to work, though not very elegantly.
> Also, it would be great to be able to send these commands by referencing the
> vendorID and productID as I'm not always certain of what index the devices
> will have if the physical connections are slightly different from system to
> system. As mentioned before my command line scripting skills are pitiful so
> any help in doing this would be appreciated.
> Any help frankly is appreciated...thanks in advance.

This is the third time you send the same mail... I have already



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