[PATCH 6.6 007/567] ALSA: usb-audio: Remove VALIDATE_RATES quirk for Focusrite devices

Greg Kroah-Hartman
2026-03-23T14:13:25Z

6.6-stable review patch. If anyone has any objections, please let me know.

------------------

From: Geoffrey D. Bennett <g@b4.vu>

[ Upstream commit a8cc55bf81a45772cad44c83ea7bb0e98431094a ]

Remove QUIRK_FLAG_VALIDATE_RATES for Focusrite. With the previous
commit, focusrite_valid_sample_rate() produces correct rate tables
without USB probing.

QUIRK_FLAG_VALIDATE_RATES sends SET_CUR requests for each rate (~25ms
each) and leaves the device at 192kHz. This is a problem because that
rate: 1) disables the internal mixer, so outputs are silent until an
application opens the PCM and sets a lower rate, and 2) the Air and
Safe modes get disabled.

Fixes: 5963e5262180 ("ALSA: usb-audio: Enable rate validation for Scarlett devices")
Signed-off-by: Geoffrey D. Bennett <g@b4.vu>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://patch.msgid.link/09b9c012024c998c4ca14bd876ef0dce0d0b6101.1771594828.git.g@b4.vu
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
sound/usb/quirks.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c
index ff2bbe761ee3a..15e72c419dbc2 100644
--- a/sound/usb/quirks.c
+++ b/sound/usb/quirks.c
@@ -2308,7 +2308,7 @@ static const struct usb_audio_quirk_flags_table quirk_flags_table[] = {
VENDOR_FLG(0x07fd, /* MOTU */
QUIRK_FLAG_VALIDATE_RATES),
VENDOR_FLG(0x1235, /* Focusrite Novation */
- QUIRK_FLAG_VALIDATE_RATES),
+ 0),
VENDOR_FLG(0x1511, /* AURALiC */
QUIRK_FLAG_DSD_RAW),
VENDOR_FLG(0x152a, /* Thesycon devices */
--
2.51.0