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ALSA: usb-audio: Add capture quirk for Behringer FCA1616

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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@posteo.net>
Link: https://patch.msgid.link/20260914002334.12691-1-autumnull@posteo.net
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Kitty Makin 2026-09-14 00:24:24 +00:00 committed by Takashi Iwai
parent 2de887f891
commit beb34fe831
1 changed files with 1 additions and 0 deletions
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sound/usb/implicit.c
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@ -76,6 +76,7 @@ static const struct snd_usb_implicit_fb_match playback_implicit_fb_quirks[] = {
/* Implicit feedback quirk table for capture: only FIXED type */
static const struct snd_usb_implicit_fb_match capture_implicit_fb_quirks[] = {
IMPLICIT_FB_FIXED_DEV(0x1397, 0x0004, 0x01, 1), /* Behringer FCA1616 */
{} /* terminator */
};