[PATCH] ALSA: usb-audio: Apply boot quirk for some Behringer models
From: Takashi Iwai
Date: Tue Sep 29 2026 - 08:07:24 EST
Jan reported that a few Behringer devices became broken since the
recent optimization to avoid usb_string() call at probe time at the
commit b364a0d23cae ("ALSA: usb-audio: Use strings in struct usb_dev
for manufacturer & co"). Interestingly, the devices seem requiring
the explicit descriptor read at probing time, and the optimization
above dropped it.
There is already a boot quirk for another model, Behringer CM1A
(1397:1234), that adds a device descriptor read, and this seems
working for them, too. So just apply the same boot quirk to those
affected models:
- Behringer K-2 Mk II (1397:1230)
- Behringer Kobol Expander (1397:1249)
- Behringer 2-XM (1397:1256)
Fixes: b364a0d23cae ("ALSA: usb-audio: Use strings in struct usb_dev for manufacturer & co")
Reported-and-tested-by: Jan Lentfer <jan.lentfer@xxxxxx>
Closes: https://lore.kernel.org/e7087d42-5e74-4d85-b1c5-b11eff235d41@xxxxxx
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
---
sound/usb/quirks.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c
index 294c7026b93c..de6a82a42eb7 100644
--- a/sound/usb/quirks.c
+++ b/sound/usb/quirks.c
@@ -1702,7 +1702,10 @@ int snd_usb_apply_boot_quirk_once(struct usb_device *dev,
switch (id) {
case USB_ID(0x07fd, 0x0008): /* MOTU M Series, 1st hardware version */
return snd_usb_motu_m_series_boot_quirk(dev);
+ case USB_ID(0x1397, 0x1230): /* Behringer K-2 Mk II */
case USB_ID(0x1397, 0x1234): /* Behringer CM1A */
+ case USB_ID(0x1397, 0x1249): /* Behringer Kobol Expander */
+ case USB_ID(0x1397, 0x1256): /* Behringer 2-XM */
return snd_usb_cm1a_boot_quirk(dev);
}
--
2.55.0