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Mon, 19 Oct 2026 10:23:51 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id YIgjBrfv1WoXWwAAD6G6ig (envelope-from ); Mon, 19 Oct 2026 10:23:51 +0000 From: Takashi Iwai To: linux-sound@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Will Bush Subject: [PATCH] ALSA: usb-audio: Avoid applying boot quirk for Behringer UMC204HD Date: Mon, 19 Oct 2026 12:23:38 +0200 Message-ID: <20261019102347.2425406-1-tiwai@suse.de> X-Mailer: git-send-email 2.55.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Flag: NO X-Spam-Score: -2.80 X-Spam-Level: X-Spamd-Result: default: False [-2.80 / 50.00]; BAYES_HAM(-3.00)[100.00%]; MID_CONTAINS_FROM(1.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; R_MISSING_CHARSET(0.50)[]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; MIME_TRACE(0.00)[0:+]; TO_DN_SOME(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; ARC_NA(0.00)[]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; TO_MATCH_ENVRCPT_ALL(0.00)[]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[3]; FROM_EQ_ENVFROM(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.de:email,suse.com:url,imap1.dmz-prg2.suse.org:helo]; RCVD_COUNT_TWO(0.00)[2]; RCVD_TLS_ALL(0.00)[] 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 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; } -- 2.55.0