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Date:   Thu, 25 Aug 2022 20:52:02 +0000
To:     Takashi Iwai <tiwai@suse.de>
From:   Lennert Van Alboom <lennert@vanalboom.org>
Cc:     Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.com>,
        "alsa-devel@alsa-project.org" <alsa-devel@alsa-project.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Reply-To: Lennert Van Alboom <lennert@vanalboom.org>
Subject: Re: USB DAC broken since commit bf6313a0ff766925462e97b4e733d5952de02367 (5.10.0-rc5)
Message-ID: <JGbq2exwKdQ4T8GQCI5YWzGredZVbYtBOxlnBN0ROtba40PvCdEKfz2mKzClqejgZMck374nGQyEIwzjiBi6sKYYNnJgKp26n1-_j6GT3hw=@vanalboom.org>
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------- Original Message -------
On Thursday, August 25th, 2022 at 12:58, Takashi Iwai <tiwai@suse.de> wrot=
e:
> =


> There are lots of workarounds for the buggy USB audio firmware, and
> the latest kernel allows to enable the quirks via quirk_flags module
> option of snd-usb-audio driver. See
> Documentation/sound/alsa-configuration.rst.
> You can try the bit 16 at first, for example.
> =


> =


> Takashi


Thanks. I tried fiddling around with it for a bit but so far limited succe=
ss. I wasn't sure about the arguments or counting order of quirk_flags (so=
me tidbits show it as hex, others as an array of booleans (?)) so tried a =
few different things. I have no other USB audio devices so didn't see a ne=
ed to specify vendor or product ID while testing. =


# modprobe snd_usb_audio quirk_flags=3D0x10000
# modprobe snd_usb_audio quirk_flags=3D0x1
# modprobe snd_usb_audio quirk_flags=3D0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1

No success with any, so far. Is there a way to make the process more verbo=
se? I can see from the lights on the DAC that the initialisation works dif=
ferently if I mess with the different quirks but that's not visible in sys=
log or outcome.


Thanks,


Lennert

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