Re: [gentoo-user] ALSA wizard...

[Jorge Almeida <jjalmeida@gmail.com>]

On Sun, Apr 26, 2020 at 12:16 AM Mark Knecht <markknecht@gmail.com> wrote:
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> You sound happier in this post. I hope we're making headway. Could you post back a view of things at this point?
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I wouldn't say happy, but at least I got to understand what the
interface does (I was more or less convinced the RCA part was broken!)

> ls /proc/asound
> cat /proc/asound/cards
> cat /proc/asound/devices
> cat /proc/asound/hwdep
> cat /proc/asound/pcm
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## ls /proc/asound/
card0  card1  cards  CODEC  devices  hwdep  PCH  pcm  seq  timers  version

## cat /proc/asound/cards
 0 [PCH            ]: HDA-Intel - HDA Intel PCH
                      HDA Intel PCH at 0xf7340000 irq 137
 1 [CODEC          ]: USB-Audio - USB Audio CODEC
                      Burr-Brown from TI USB Audio CODEC at
usb-0000:00:14.0-10, full speed

## cat /proc/asound/devices
  1:        : sequencer
  2: [ 0- 0]: digital audio playback
  3: [ 0- 0]: digital audio capture
  4: [ 0- 1]: digital audio playback
  5: [ 0- 2]: digital audio capture
  6: [ 0- 3]: digital audio playback
  7: [ 0]   : control
  8: [ 1- 0]: digital audio playback
  9: [ 1- 0]: digital audio capture
 10: [ 1]   : control
 33:        : timer

## cat /proc/asound/hwdep

## cat /proc/asound/pcm
00-00: Generic Analog : Generic Analog : playback 1 : capture 1
00-01: Generic Digital : Generic Digital : playback 1
00-02: Generic Alt Analog : Generic Alt Analog : capture 1
00-03: Generic Digital : Generic Digital : playback 1

> If you run alsamixer what card is it showing you when you first go in?
The MB card.
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> Not knowing these applications I'm at a distance trying to make suitable suggestions. I'm fairly sure you won't like the next one...
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> How do you feel about building Alsa as modules instead of building it into the kernel? When using modules you can blacklist other sound cards (the MB audio stuff for instance) and you get a little more visibility into what's is at least loaded. That way we could, at least as a test, run your setup as a USB only system. If at that point you can record mix audio in something like Audacity and play Audacity and Youtube through the Behringer then, I would think, we would have determined that this is an application issue.
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Will try that, why not? (Tomorrow morning)

> While it shouldn't matter I assume you tried slack and discord with direct monitoring turned off and on? I would expect that off is the right way for an application like these but it makes sense to at least press the button to see if it changes anything.

I tried discord; I heard the sound, the other side didn't.
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> I'm really intrigued to see if we can figure this out.
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I'm now compiling zoom, after removing the ~amd64 from the ebuild (I
will not have an unstable qt all over my system). We'll see...

Thanks

Jorge