https://bugs.freedesktop.org/show_bug.cgi?id=94357
--- Comment #1 from Raymond <[email protected]> ---
pulseaudio don't like the multi channel volume control
you have add PCM Capture Source in pulseaudio input conf files
https://cgit.freedesktop.org/pulseaudio/pulseaudio/tree/src/modules/alsa/mixer/paths
what are the usage of two PCM Playback Volume Controls
Card hw:1 'U5'/'VIA Technologies Inc. MAYA U5 at usb-0000:00:1a.0-1.3, full
speed'
Mixer name : 'USB Mixer'
Components : 'USB040d:3401'
Controls : 23
Simple ctrls : 10
Simple mixer control 'Speaker',0
Capabilities: pvolume pswitch pswitch-joined
Playback channels: Front Left - Front Right - Rear Left - Rear Right - Front
Center - Woofer
Limits: Playback 0 - 30
Mono:
Front Left: Playback 16 [53%] [-21.00dB] [on]
Front Right: Playback 16 [53%] [-21.00dB] [on]
Rear Left: Playback 16 [53%] [-21.00dB] [on]
Rear Right: Playback 16 [53%] [-21.00dB] [on]
Front Center: Playback 16 [53%] [-21.00dB] [on]
Woofer: Playback 16 [53%] [-21.00dB] [on]
Simple mixer control 'PCM',0
Capabilities: volume
Playback channels: Front Left - Front Right
Capture channels: Front Left - Front Right
Limits: 0 - 1
Front Left: 1 [100%]
Front Right: 1 [100%]
Simple mixer control 'PCM Capture Source',0
Capabilities: enum
Items: 'Microphone' 'Line In' 'Stereo Mix' 'Spdif Rx'
Item0: 'Microphone'
Simple mixer control 'PCM',1
Capabilities: volume
Playback channels: Front Left - Front Right
Capture channels: Front Left - Front Right
Limits: 0 - 1
Front Left: 1 [100%]
Front Right: 1 [100%]
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