USB-Audio regression on behringer UMC404HD

[Takashi Iwai]

On Tue, 03 Jan 2023 16:05:18 +0100,
Michael Ralston wrote:
> 
> On Wed, 4 Jan 2023 at 00:38, Takashi Iwai <tiwai at suse.de> wrote:
> >
> > Thanks; that's helpful.
> >
> > Could you try to revert the commit
> > 9902b303b5ade208b58f0dd38a09831813582211
> >     ALSA: usb-audio: Avoid unnecessary interface change at EP close
> as a blind shot?
> >
> > Also, there has been a series of fixes for other issues, and it might
> > be worth to try as well:
> >   https://lore.kernel.org/r/20230102170759.29610-1-tiwai@suse.de
> >
> 
> I built 3 kernels: one with the reverted commit, one with the patches
> you linked, and one with both. These builds were based on 6.1.2.
> 
> None of them worked. Also, even though I continued to boot with
> snd_usb_audio.dyndbg=+p, none of the kernel logs showed the debug
> messages that the other versions did. I'm baffled why this is.

That's weird.  Is snd_usb_audio driver bound with the device at all?
That is, does it appear in /proc/asound/cards?


Takashi