Re: USB-Audio regression on behringer UMC404HD

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On Wed, 4 Jan 2023 at 00:38, Takashi Iwai <tiwai@xxxxxxx> 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@xxxxxxx
>

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.

I did notice that the order that the detected sound devices appeared
in alsa was varying. That's probably not relevant though.

Links to logs:

Revert only
https://hastebin.com/avinasiruj.apache

New patches only
https://hastebin.com/aqepesokam.apache

Both
https://hastebin.com/igilaqujus.apache

--
Michael



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