------- Original Message -------
On Friday, August 26th, 2022 at 08:05, Takashi Iwai <tiwai@suse.de> wrote:
> 

> This option is passed per card instance, as the driver may hold
> multiple cards. Check your /proc/asound/cards. The first argument of
> quirk_flags is applied to the first USB-audio card, the second to the
> second USB audio device, and so on.
> 

> At best, give alsa-info.sh output before and after applying the
> quirk. Run the script with --no-upload option and attach the
> outputs.
> 

> And, as a reference, you can see the existing quirk tables in
> sound/usb/quirks.c.
> 

> 

> Takashi


Not sure why it failed before (didn't look further then, so possibly PEBKAC) but as you suggested, this works now (tested on debian's 5.19 kernel):

# modprobe snd_usb_audio vid=0x2522 pid=0x0007 quirk_flags=0x10000


Confirmed that setting a quirk_alias also works: 


# grep -A 1 "0x054c, 0x0b8c" linux/sound/usb/quirks.c 

	DEVICE_FLG(0x054c, 0x0b8c, /* Sony WALKMAN NW-A45 DAC */
		   QUIRK_FLAG_SET_IFACE_FIRST),
# modprobe snd_usb_audio quirk_alias=25220007:054c0b8c


I've added a patch for quirks.c to make this default behaviour for this device. Looking at the Arch bug report at https://bugs.archlinux.org/task/70636, it's likely similar behaviour may be needed for pid=0009 (LH Labs Geek Pulse X 1V5) but I have no way of testing this. Added the reporter in CC.


Thanks,


Lennert