alsa-project alsa-ucm : Audio endpoint is not switching when external mic connected

[Takashi Iwai]

On Wed, 03 Jun 2020 02:36:25 +0200,
Hui Wang wrote:
> 
> 
> On 2020/6/3 上午3:39, Jaroslav Kysela wrote:
> > Dne 02. 06. 20 v 19:57 Mukunda, Vijendar napsal(a):
> >> We recently up streamed ACP PDM driver for Renoir APU.
> >>
> >> Our ACP IP has an internal PDM Decoder block where DMIC is directly
> >> connected.
> >> There are no KControls defined for PDM Driver.
> >>
> >> Our platform supports on board DMIC and South bridge Azalia (HD
> >> Audio ) endpoint .
> >> By default, DMIC endpoint is used as audio input device.
> >> When Headset Mic jack connected, it's not switching to External Mic.
> >
> > Make sure that the Headset Mic priority port in pulseaudio is is
> > greater than the one for DMIC.
> >
> >> How does audio endpoint will switch in gnome when external mic is
> >> connected?
> >>> From our understanding, UCM conf file for HDA driver is also
> >>> required for 
> >> configuring mixer controls for HD Audio capture device.
> >> Similarly when External Mic is removed , it has to switch to
> >> internal dmic .
> >
> > An configuration example for UCM (DMIC connected to DSP, HDA codec
> > for rest):
> >
> > https://github.com/alsa-project/alsa-ucm-conf/tree/master/ucm2/sof-hda-dsp
> >
> > If you need a help to create a new configuration for your hardware,
> > show the output from the alsa-info.sh script, please.
> >
> >                     Jaroslav
> 
> This audio design is  a bit different from sof-hda-dsp, the dmic is on
> a standalone sound card. Please see the alsa-info.txt:
> 
> https://pastebin.ubuntu.com/p/4kprhDZYbg/

And that's an interesting case.  Can we manage multiple cards in a
single UCM profile?


Takashi