[PATCH] ALSA: usb-audio: Exclude Scarlett 2i2 1st Gen from SKIP_IFACE_SETUP

[PATCH] ALSA: usb-audio: Exclude Scarlett 2i2 1st Gen from SKIP_IFACE_SETUP

[Geoffrey D. Bennett]

The Focusrite Scarlett 2i2 1st Gen (1235:8006) produces
distorted/silent audio when QUIRK_FLAG_SKIP_IFACE_SETUP is active, as
that flag causes the feedback format to be detected as 17.15 instead
of 16.16.

Add a DEVICE_FLG entry for this device before the Focusrite VENDOR_FLG
entry so that it gets no quirk flags, overriding the vendor-wide
SKIP_IFACE_SETUP. This device doesn't have the internal mixer, Air, or
Safe modes that the quirk was designed to protect.

Fixes: 38c322068a26 ("ALSA: usb-audio: Add QUIRK_FLAG_SKIP_IFACE_SETUP")
Reported-by: pairomaniac [https://github.com/geoffreybennett/linux-fcp/issues/54]
Tested-by: pairomaniac [https://github.com/geoffreybennett/linux-fcp/issues/54]
Signed-off-by: Geoffrey D. Bennett <g@b4.vu>
---
 sound/usb/quirks.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c
index ffc08ee869ae..a28be9115440 100644
--- a/sound/usb/quirks.c
+++ b/sound/usb/quirks.c
@@ -2423,6 +2423,7 @@ static const struct usb_audio_quirk_flags_table quirk_flags_table[] = {
 		   QUIRK_FLAG_CTL_MSG_DELAY | QUIRK_FLAG_IFACE_DELAY),
 	VENDOR_FLG(0x07fd, /* MOTU */
 		   QUIRK_FLAG_VALIDATE_RATES),
+	DEVICE_FLG(0x1235, 0x8006, 0), /* Focusrite Scarlett 2i2 1st Gen */
 	VENDOR_FLG(0x1235, /* Focusrite Novation */
 		   QUIRK_FLAG_SKIP_CLOCK_SELECTOR |
 		   QUIRK_FLAG_SKIP_IFACE_SETUP),
-- 
2.53.0

Re: [PATCH] ALSA: usb-audio: Exclude Scarlett 2i2 1st Gen from SKIP_IFACE_SETUP

[Takashi Iwai]

On Tue, 17 Mar 2026 20:32:30 +0100,
Geoffrey D. Bennett wrote:
> 
> The Focusrite Scarlett 2i2 1st Gen (1235:8006) produces
> distorted/silent audio when QUIRK_FLAG_SKIP_IFACE_SETUP is active, as
> that flag causes the feedback format to be detected as 17.15 instead
> of 16.16.
> 
> Add a DEVICE_FLG entry for this device before the Focusrite VENDOR_FLG
> entry so that it gets no quirk flags, overriding the vendor-wide
> SKIP_IFACE_SETUP. This device doesn't have the internal mixer, Air, or
> Safe modes that the quirk was designed to protect.
> 
> Fixes: 38c322068a26 ("ALSA: usb-audio: Add QUIRK_FLAG_SKIP_IFACE_SETUP")
> Reported-by: pairomaniac [https://github.com/geoffreybennett/linux-fcp/issues/54]
> Tested-by: pairomaniac [https://github.com/geoffreybennett/linux-fcp/issues/54]
> Signed-off-by: Geoffrey D. Bennett <g@b4.vu>

Applied now.  Thanks.


Takashi