Re: [PATCH] ALSA: usb-audio: Add capture quirk for Behringer FCA1616

[Takashi Iwai]

On Mon, 14 Sep 2026 02:24:24 +0200,
Kitty Makin wrote:
> 
> The Behringer FCA1616 (1397:0004) returns silent capture samples unless its
> playback endpoint is active.
> 
> Use the existing fixed implicit-feedback mechanism to keep playback endpoint
> 0x01 on interface 1 active during capture.
> 
> Tested with 16-channel S32_LE capture at 44.1 and 48 kHz.
> 
> Signed-off-by: Kitty Makin <autumnull@xxxxxxxxxx>

It's interesting that this capture implicit quirk is still needed.
Maybe we can work around in a different way, but this addition would
be likely simpler.  Let's see whether any other devices need to follow
this pattern, then we can rethink.

In anyway, applied now.  Thanks.


Takashi