From e88f4749c02fba11c62e880c29d35d254b7e69d0 Mon Sep 17 00:00:00 2001 From: Takashi Iwai Date: Mon, 19 Oct 2026 12:23:38 +0200 Subject: [PATCH] ALSA: usb-audio: Avoid applying boot quirk for Behringer UMC204HD There have been reports about a regression with the recent boot quirk for Behringer devices; it broke UMC204HD models(1397:0508 and 1397:0509). The quirk was to just run usb_get_descriptor(), so I expected it rather harmful, but in this case, it doesn't look so, resulting in an error like 'failed to read device descriptor: -110' that leads to a fatal probe error. As a quick workaround, skip the quirk for those UMC204HD models. Fixes: b5c4823cf3e4 ("ALSA: usb-audio: Apply boot quirk for Behringer models generically") Reported-by: Will Bush Closes: https://lore.kernel.org/45162613-2802-401c-84c9-742f9c8c68e6@app.fastmail.com Closes: https://bugzilla.suse.com/show_bug.cgi?id=1285896 Link: https://patch.msgid.link/20261019102347.2425406-1-tiwai@suse.de Signed-off-by: Takashi Iwai --- sound/usb/quirks.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c index 4fadb1fdcdea..4ac4aef47dd7 100644 --- a/sound/usb/quirks.c +++ b/sound/usb/quirks.c @@ -1790,8 +1790,15 @@ int snd_usb_apply_boot_quirk_once(struct usb_device *dev, } /* Behringer devices may need explicit device descriptor read at boot */ - if (USB_ID_VENDOR(id) == 0x1397) + if (USB_ID_VENDOR(id) == 0x1397) { + /* the quirk seems breaking on some Behringer devices */ + switch (id) { + case USB_ID(0x1397, 0x0508): /* UMC204HD */ + case USB_ID(0x1397, 0x0509): /* UMC204HD */ + return 0; + } return snd_usb_cm1a_boot_quirk(dev); + } return 0; }