[alsa-devel] Internal Mic Boost channel is unused

[Nathanael D. Noblet]

Sorry I some how deleted your response... so this may not thread well...

Only about 20% of what you said makes much sense to me so you'll have to 
bear with me...

>>
>>  1) I have the following hardware (alsa-info attached).
>
> Simple mixer control 'Input Source',0
> Capabilities: cenum Items: 'Mic' 'Internal Mic' 'Mic 1'
> Item0: 'Internal Mic'
> Simple mixer control 'Input Source',1
> Capabilities: cenum Items: 'Mic' 'Internal Mic' 'Mic 1'
> Item0: 'Internal Mic'
> Simple mixer control 'Input Source',2
> Capabilities: cenum Items: 'Mic' 'Internal Mic' 'Mic 1'
> Item0: 'Internal Mic'
>
>
> using hda-emu
>
> the driver always use selector 0x17 for the three input source controls
>
> 6 Input Source:0
> ITEM: 0:Mic, 1:Mic 1, 2:Internal Mic, VAL: [Mic]
>> set 6 2
> send: NID=0x14, VERB=0x701(set_connect_sel), PARM=0x0
> receive: 0x0
> send: NID=0x17, VERB=0x701(set_connect_sel), PARM=0x3
> receive: 0x0
>> set 7 2
> send: NID=0x15, VERB=0x701(set_connect_sel), PARM=0x0
> receive: 0x0
> send: NID=0x17, VERB=0x701(set_connect_sel), PARM=0x3
> receive: 0x0
>> set 8 2
> send: NID=0x16, VERB=0x701(set_connect_sel), PARM=0x0
> receive: 0x0
> send: NID=0x17, VERB=0x701(set_connect_sel), PARM=0x3
> receive: 0x0
>
> It is a bug of the driver to create three input source select controls when
> there are only two audio selectors 0x17 and 0x18 as node 0x23 is not one of
> the input pins
>
> The topology does not allow three different input sources with two selectors

Ok so the that makes sense but I'm not sure what you want me to do about it.

>
>  >  2) The internal microphone requires that the mic boost channel be
> something other than 0 to function properly.
>
> You have to find out whether node 0x1a or 0x1b can be used as the headset
> jack (headphone with Mic using TRRS connector)

So basically I need to plug a microphone into each port and figure out 
if both of them work as microphone. A couple things.

1) What if both can be a microphone?
2) If only one can be a microphone, I have no idea how to tell you if 
its 0x1a or 0x1b.. hda-analyzer/alsa low level stuff is completely new 
to me.

>
>>  3) Changing what pulseaudio expects things to be labelled causes the
> problem to go away. (via the attached patch to
> /usr/share/pulseaudio/paths/analog-input-mic.conf).
>>
>>   From the discussion with David Henningsson (diwic on IRC). It seems
> that pulse doesn't expect a Mic Boost channel to be used with internal
> microphones. As such to fix this particular hardware, the driver would need
> to make the internal mic boost be labelled "Internal Mic Boost" as opposed
> to Mic Boost, which is then is used for both external and internal mics.
>>
>
> Node 0x14 [Audio Input] wcaps 0x100d1b: Stereo Amp-In R/L
> Control: name="Capture Volume", index=0, device=0 ControlAmp: chs=3,
> dir=In, idx=0, ofs=0
> Control: name="Capture Switch", index=0, device=0 ControlAmp: chs=3,
> dir=In, idx=0, ofs=0
> Device: name="CX20588 Analog", type="Audio", device=0 Amp-In caps:
> ofs=0x4a, nsteps=0x50, stepsize=0x03, mute=1
> Amp-In vals: [0x50 0x50] [0x80 0x80] [0x80 0x80] [0x80 0x80]
> Converter: stream=4, channel=0 SDI-Select: 0
> PCM: rates [0x160]: 44100 48000 96000
> bits [0xe]: 16 20 24
> formats [0x1]: PCM
> Power states: D0 D1 D2 D3 D3cold EPSS Power: setting=D0, actual=D0
> Connection: 4
> 0x17* 0x18 0x23 0x24
>
> Node 0x24 [Audio Mixer] wcaps 0x20050b: Stereo Amp-In
> Amp-In caps: ofs=0x4a, nsteps=0x4a, stepsize=0x03, mute=1
> Amp-In vals: [0x00 0x00] [0x00 0x00]
> Power states: D0 D1 D2 D3 D3cold EPSS
> Power: setting=D0, actual=D0
> Connection: 2
> 0x10 0x11
>
> BTW there seem to be an audio path from DAC to ADC throungh audio mixer
> 0x24, does this allow you to record the DAC playback directly ? Using
> hda-analyzer to change the selection of  audio input node 0x14 and fix the
> amps at node 0x24

I have no idea what DAC to ADC means. If you want me to do something to 
test I can do that.

One more thing, if getting this properly fixed can be sped up via a ssh 
login and IRC chat I can give you access to the machine and be on IRC 
whenever to get it working.

-- 
Nathanael d. Noblet
t 403.875.4613