Motu M4 - where to report this issue?

From: Georges Basile Stavracas Neto <georges.stavracas@gmail.com>
To: alsa-devel@alsa-project.org
Subject: Motu M4 - where to report this issue?
Date: Fri, 21 May 2021 15:49:04 -0300	[thread overview]
Message-ID: <S90HTQ.U7YWJKIETGYG2@gmail.com> (raw)

Greetings ALSA community,

I recently acquired a Motu M4 interface, and seems to be working
well so far. Everyday usage is completely functional.

However, I noticed an odd sound artifact that happens from time
to time when using DAWs like Ardour and Waveform11. It's a windy,
ghostly sound that happens whenever I open any DAWs (the simple
act of opening them triggers this). Interestingly, audio apps that
use PulseAudio do not suffer from this issue. It's hard to describe
it, so I recorded a video reproducing this problem:

https://youtu.be/bM8x-YuXLVI

A few things I've discovered while trying to understand what's
going on:

* It only happens with apps that use JACK or ALSA APIs. Using
  PulseAudio (through PipeWire) does not trigger it.

* Seems like this sound is not an artifact of the interface; it
  appears that this odd sound is sent to the interface through
  USB. (You can see this in the video.)

* It's triggered per track; in the video, for example, the drums
  and keyboard tracks are affected independetly.

I was oriented in #alsa at Freenode that the output of 'alsa-info'
might be helpful, so here it is:

http://alsa-project.org/db/?f=62f686710cc6c9344a8986707bf3d09248c514d1

(I'm running this on top of a 5.12.5 kernel, which should include
this fix: https://bugzilla.kernel.org/show_bug.cgi?id=207023)

I'd like to know where should I report this bug (kernel bugzilla?),
and if there's any other information I can provide to help fixing
it.

With respect,
Georges