auto Mic selection between internal Mic and external Mic is not possible
after the addition of stereo mix input which allow you select the audio
mixer 0x21 as input source which contain the signal from the audio
output
Node 0x1e [Audio Selector] wcaps 0x300501: Stereo
Control: name="Input Source", index=0, device=0
Power states: D0 D1 D2 D3
Power: setting=D0, actual=D0
Connection: 5
0x2b* 0x2a 0x29 0x21 0x30
pcm loopback playback switch and volume control the input from the hidden
connection from node 0x08 (idx=3) which is the hidden fourth entry in the
connection list
Node 0x21 [Audio Mixer] wcaps 0x20050b: Stereo Amp-In
Control: name="PCM Loopback Playback Volume", index=0, device=0
ControlAmp: chs=3, dir=In, idx=3, ofs=0
Control: name="PCM Loopback Playback Switch", index=0, device=0
ControlAmp: chs=3, dir=In, idx=3, ofs=0
Control: name="Mic Playback Volume", index=0, device=0
ControlAmp: chs=3, dir=In, idx=0, ofs=0
Control: name="Mic Playback Switch", index=0, device=0
ControlAmp: chs=3, dir=In, idx=0, ofs=0
Control: name="Internal Mic Playback Volume", index=0, device=0
ControlAmp: chs=3, dir=In, idx=2, ofs=0
Control: name="Internal Mic Playback Switch", index=0, device=0
ControlAmp: chs=3, dir=In, idx=2, ofs=0
Amp-In caps: ofs=0x17, nsteps=0x1f, stepsize=0x05, mute=1
Amp-In vals: [0x18 0x18] [0x80 0x80] [0x17 0x17]
Power states: D0 D1 D2 D3
Power: setting=D0, actual=D0
Connection: 3
0x2b 0x2a 0x29
Simple mixer control 'PCM Loopback',0
Capabilities: pvolume pswitch penum
Playback channels: Front Left - Front Right
Limits: Playback 0 - 31
Mono:
Front Left: Playback 23 [74%] [0.00dB] [on]
Front Right: Playback 23 [74%] [0.00dB] [on]
the headphone and speaker are connected to audio output 0x08 and 0x09 through
audio mixer 0x21 when loopback mixing is enabled instead of through audio
selector 0x34 and 0x35
Simple mixer control 'Loopback Mixing',0
Capabilities: enum
Items: 'Disabled' 'Enabled'
Item0: 'Disabled'
Node 0x14 [Audio Mixer] wcaps 0x20050b: Stereo Amp-In
Amp-In caps: ofs=0x00, nsteps=0x00, stepsize=0x00, mute=1
Amp-In vals: [0x00 0x00] [0x80 0x80]
Power states: D0 D1 D2 D3
Power: setting=D0, actual=D0
Connection: 2
0x34 0x21
Node 0x15 [Audio Mixer] wcaps 0x20050b: Stereo Amp-In
Amp-In caps: ofs=0x00, nsteps=0x00, stepsize=0x00, mute=1
Amp-In vals: [0x00 0x00] [0x80 0x80]
Power states: D0 D1 D2 D3
Power: setting=D0, actual=D0
Connection: 2
0x35 0x21
Node 0x34 [Audio Selector] wcaps 0x300501: Stereo
Power states: D0 D1 D2 D3
Power: setting=D0, actual=D0
Connection: 2
0x08* 0x09
Node 0x35 [Audio Selector] wcaps 0x300501: Stereo
Power states: D0 D1 D2 D3
Power: setting=D0, actual=D0
Connection: 2
0x08 0x09*
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https://bugs.launchpad.net/bugs/1180477
Title:
[Gazelle Professional, VIA VT1802, Mic, Internal] No sound at all
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