USB DAC broken since commit bf6313a0ff766925462e97b4e733d5952de02367 (5.10.0-rc5)

[Lennert Van Alboom]

------- Original Message -------
On Thursday, August 25th, 2022 at 12:58, Takashi Iwai <tiwai at suse.de> wrote:
> 

> 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 success. I wasn't sure about the arguments or counting order of quirk_flags (some 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 need to specify vendor or product ID while testing. 


# modprobe snd_usb_audio quirk_flags=0x10000
# modprobe snd_usb_audio quirk_flags=0x1
# modprobe snd_usb_audio quirk_flags=0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1

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


Thanks,


Lennert
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