PCM Capture Source of usb audio not supported by pulseaudio

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>>
>> Do you mean mic capture volume always reset to maximum by driver or
pulseaudio ?
>
> No
>>
>> pactl list sources
>
> http://pastebin.com/Dd0XLamN

Seem usb audio is not your default source

Refer to pact list sources in

https://bugs.freedesktop.org/show_bug.cgi?id=90781#c32

Ð?оÑ?Ñ?и:
                analog-input-mic: Ð?Ñ?кÑ?оÑ?он (priority: 8700)
                analog-input-linein: Ð?Ñ?нÑ?йний вÑ?Ñ?д (priority: 8100)
        Ð?кÑ?ивний поÑ?Ñ?: analog-input-linein

The active port is linein , pulseaudio does not use the source in alsa  pcm
capture source control as active ports when there are no jack detection
control.

http://cgit.freedesktop.org/pulseaudio/pulseaudio/tree/src/modules/alsa/mixer/paths/analog-input.conf.common

;
;  We explicitly don't want to wrap the following sources:
;
;       CD
;       Synth/MIDI
;       Phone
;       Mix
;       Digital/SPDIF
;       Master
;       PC Speaker

http://www.alsa-project.org/alsa-doc/alsa-lib/group___simple_mixer.html#ga6679dc52033e29b88da32f5bbd45f205

To achieve the above logic, it does not use snd_mixer_selem_get_enum_item()
in alsa-mixer.c to get the current selected enumerated item for the given
mixer simple element to set the active port

linein is the default port when there are no jack detection kctl in current
implementation
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