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Sun, 18 Oct 2026 16:42:48 +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 zL6LGAj31GrKLgAAD6G6ig (envelope-from ); Sun, 18 Oct 2026 16:42:48 +0000 Date: Sun, 18 Oct 2026 18:42:47 +0200 Message-ID: <87tsmjarjs.wl-tiwai@suse.de> From: Takashi Iwai To: "Will Bush" Cc: "Takashi Iwai" , "Jaroslav Kysela" , linux-sound@vger.kernel.org, regressions@lists.linux.dev, stable@vger.kernel.org, "Jan Lentfer" , Sebastian =?ISO-8859-1?Q?Dalfu=DF?= Subject: Re: [REGRESSION] usb-audio: Behringer UMC204HD broken in 7.2.10 In-Reply-To: <45162613-2802-401c-84c9-742f9c8c68e6@app.fastmail.com> References: <45162613-2802-401c-84c9-742f9c8c68e6@app.fastmail.com> User-Agent: Wanderlust/2.15.9 (Almost Unreal) Emacs/30.2 Mule/6.0 Precedence: bulk X-Mailing-List: linux-sound@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=US-ASCII X-Rspamd-Action: no action X-Spam-Score: -3.51 X-Spam-Flag: NO X-Spamd-Result: default: False [-3.51 / 50.00]; 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DBL_BLOCKED_OPENRESOLVER(0.00)[suse.de:dkim,imap1.dmz-prg2.suse.org:helo,imap1.dmz-prg2.suse.org:rdns] X-Spam-Level: X-Rspamd-Queue-Id: 13FF621C3C X-Rspamd-Server: rspamd2.dmz-prg2.suse.org On Sun, 18 Oct 2026 18:34:27 +0200, Will Bush wrote: > > Hi Takashi, > > Thanks for all your work on usb-audio. I was updating my system (NixOS), which > took me from 7.2.9 to 7.2.10, and my Behringer UMC204HD device stopped working. > > It gets into a loop: > > [ 225.148019] blazar kernel: usb 3-4: new high-speed USB device number 19 using xhci_hcd > [ 225.340016] blazar kernel: usb 3-4: New USB device found, idVendor=1397, idProduct=0508, bcdDevice= 1.35 > [ 225.366005] blazar kernel: usb 3-4: New USB device strings: Mfr=1, Product=2, SerialNumber=0 > [ 225.366187] blazar kernel: usb 3-4: Product: UMC204HD 192k > [ 225.366304] blazar kernel: usb 3-4: Manufacturer: BEHRINGER > [ 230.493021] blazar kernel: usb 3-4: failed to read device descriptor: -110 > [ 230.493313] blazar kernel: snd-usb-audio 3-4:1.0: probe with driver snd-usb-audio failed with error -110 > [ 235.612029] blazar kernel: usb 3-4: failed to read device descriptor: -110 > [ 235.612302] blazar kernel: snd-usb-audio 3-4:1.3: probe with driver snd-usb-audio failed with error -110 > [ 240.732035] blazar kernel: usb 3-4: failed to read device descriptor: -110 > [ 240.732461] blazar kernel: snd-usb-audio 3-4:1.4: probe with driver snd-usb-audio failed with error -110 > [ 240.732538] blazar kernel: usb 3-4: USB disconnect, device number 19 > [ 241.019061] blazar kernel: usb 3-4: new high-speed USB device number 20 using xhci_hcd > > Issue seems to be from commit: b5c4823cf3e4 ("ALSA: usb-audio: Apply boot quirk for Behringer models generically") > > I was able to patch 7.2.10 to get it working again: > > - if (USB_ID_VENDOR(id) == 0x1397) > + if (id == USB_ID(0x1397, 0x1234)) > > Not sure if applying the quirk to every Behringer device is too broad or what > the fix should be. Ping me if you want me to test a patch. > > #regzbot introduced: b5c4823cf3e4 Interesting, it's just a descriptor read and this fails on your device by some reason. Could you try to ignore the error like below, and verify whether it continues to work? thanks, Takashi --- a/sound/usb/quirks.c +++ b/sound/usb/quirks.c @@ -865,7 +865,7 @@ static int snd_usb_cm1a_boot_quirk(struct usb_device *dev) err = usb_get_descriptor(dev, USB_DT_DEVICE, 0, desc, sizeof(*desc)); if (err < 0) { dev_err(&dev->dev, "failed to read device descriptor: %d\n", err); - return err; + // return err; } return 0;