From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp-out2.suse.de (smtp-out2.suse.de [195.135.223.131]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E2F3933A9DA; Mon, 14 Sep 2026 06:18:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=195.135.223.131 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789366739; cv=none; b=Z7c2CnPbhPJXse2gm33UQ65k+eWo2q2c9yKUMizWOY2P4kjJv/XtYgSD77oNEIPuaFidWxZpiQWp4K6LY/K9oI/WfkE+8danCmi2xaBBb9DKhebT6pfLjVX7O17PxLuLsaasx0W/6tcAShvskGF8dsya0Tn9GYVYoJw0fTkjcqc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789366739; c=relaxed/simple; bh=m2PW9f08I8Cu6oA63ICxXggNLlKtBNbpdY/lIEtGxKM=; h=Date:Message-ID:From:To:Cc:Subject:In-Reply-To:References: MIME-Version:Content-Type; b=pRjN9ScWljwHFyOFPkf24x4zOZINeYboFbtXLm54xkw/sQyx7aNvcSLY/o5HEpnMvgjW1i7HPGRUtHLu8a4/L1iPS1jJAYTqW9Qlnt1jtfKphTBF/g2HvrSgIrIVc4WBOcv01/7mp1sZ7FyMpDp49EAcBISGtTZCCh+cfQ1IUYI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=suse.de; spf=pass smtp.mailfrom=suse.de; dkim=pass (1024-bit key) header.d=suse.de header.i=@suse.de header.b=BY9RqkbX; dkim=permerror (0-bit key) header.d=suse.de header.i=@suse.de header.b=Of+GPmO7; dkim=pass (1024-bit key) header.d=suse.de header.i=@suse.de header.b=A5VMkhH0; dkim=permerror (0-bit key) header.d=suse.de header.i=@suse.de header.b=CSmxQcv2; arc=none smtp.client-ip=195.135.223.131 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=suse.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=suse.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=suse.de header.i=@suse.de header.b="BY9RqkbX"; dkim=permerror (0-bit key) header.d=suse.de header.i=@suse.de header.b="Of+GPmO7"; dkim=pass (1024-bit key) header.d=suse.de header.i=@suse.de header.b="A5VMkhH0"; dkim=permerror (0-bit key) header.d=suse.de header.i=@suse.de header.b="CSmxQcv2" Received: from imap1.dmz-prg2.suse.org (imap1.dmz-prg2.suse.org [IPv6:2a07:de40:b281:104:10:150:64:97]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by smtp-out2.suse.de (Postfix) with ESMTPS id 7AB911F836; Mon, 14 Sep 2026 06:18:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1789366731; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=oZme78kNXZgDxFQ2xY8OCjMvaXH+aom+uvlM9QLK0XU=; b=BY9RqkbX4uwC6bkFq0DM3hHCk69MbZ+PWWL4gnTML8JxE9Z8QjN/gpCj7e+gkglykZGaWj Ip3aQhRtUvLDEMBg4yQ7m1POruDM3KD6aeTAZtaMNG5cQsfc46bggQMChRqRCAQbICXutj e2VSyxXapmYhNK7PArIh0KHXIA1UO7g= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1789366731; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=oZme78kNXZgDxFQ2xY8OCjMvaXH+aom+uvlM9QLK0XU=; b=Of+GPmO7pLoJlCS18w1zEyXUhYLKOWq5qtSyibLGHdeAnDndUtmxBDR35jXWcThu6msSZr cVrH0zFRAsyRyXDw== Authentication-Results: smtp-out2.suse.de; dkim=pass header.d=suse.de header.s=susede2_rsa header.b=A5VMkhH0; dkim=pass header.d=suse.de header.s=susede2_ed25519 header.b=CSmxQcv2 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1789366727; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=oZme78kNXZgDxFQ2xY8OCjMvaXH+aom+uvlM9QLK0XU=; b=A5VMkhH0OQKa5R2q/9PpXPq74v68+0NZgqIhQB1DuB0gHp1Ney99nkZu4moYAs7l+v0UUI XU0ZbIxOfJKM7TIL5mxPQIM0LsS13chDGXiC+SNv0b5MQ77Kd0d5GwYco2/EVxfxx9hbZO gFg7geiuljsISYl50+cKaYN+A9WUHik= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1789366727; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=oZme78kNXZgDxFQ2xY8OCjMvaXH+aom+uvlM9QLK0XU=; b=CSmxQcv2AkdA+S9vYcOE+UAArRyAukPIROvXn0eKRCI5/hyrwJymInfyVPouRL85lnis+6 UCVUXkt9XbD3PpBA== Received: from imap1.dmz-prg2.suse.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by imap1.dmz-prg2.suse.org (Postfix) with ESMTPS id 2B74613515; Mon, 14 Sep 2026 06:18:47 +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 tvBOCceRp2pABAAAD6G6ig (envelope-from ); Mon, 14 Sep 2026 06:18:47 +0000 Date: Mon, 14 Sep 2026 08:18:46 +0200 Message-ID: <87se3cqrsp.wl-tiwai@suse.de> From: Takashi Iwai To: Kitty Makin Cc: linux-sound@vger.kernel.org, tiwai@suse.com, perex@perex.cz, linux-kernel@vger.kernel.org Subject: Re: [PATCH] ALSA: usb-audio: Add capture quirk for Behringer FCA1616 In-Reply-To: <20260914002334.12691-1-autumnull@posteo.net> References: <20260914002334.12691-1-autumnull@posteo.net> User-Agent: Wanderlust/2.15.9 (Almost Unreal) Emacs/30.2 Mule/6.0 Precedence: bulk X-Mailing-List: linux-kernel@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-Spam-Level: X-Rspamd-Action: no action X-Rspamd-Server: rspamd2.dmz-prg2.suse.org X-Rspamd-Queue-Id: 7AB911F836 X-Spamd-Result: default: False [-3.51 / 50.00]; BAYES_HAM(-3.00)[99.99%]; MID_CONTAINS_FROM(1.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; R_DKIM_ALLOW(-0.20)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; MX_GOOD(-0.01)[]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; RBL_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:104:10:150:64:97:from]; MIME_TRACE(0.00)[0:+]; ARC_NA(0.00)[]; TO_DN_SOME(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; FROM_HAS_DN(0.00)[]; RCVD_TLS_ALL(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; FROM_EQ_ENVFROM(0.00)[]; RCPT_COUNT_FIVE(0.00)[5]; RECEIVED_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:106:10:150:64:167:received]; DKIM_TRACE(0.00)[suse.de:+]; RCVD_VIA_SMTP_AUTH(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.de:dkim,suse.de:mid,posteo.net:email,imap1.dmz-prg2.suse.org:rdns,imap1.dmz-prg2.suse.org:helo] X-Spam-Flag: NO X-Spam-Score: -3.51 On Mon, 14 Sep 2026 02:24:24 +0200, Kitty Makin wrote: > > The Behringer FCA1616 (1397:0004) returns silent capture samples unless its > playback endpoint is active. > > Use the existing fixed implicit-feedback mechanism to keep playback endpoint > 0x01 on interface 1 active during capture. > > Tested with 16-channel S32_LE capture at 44.1 and 48 kHz. > > Signed-off-by: Kitty Makin It's interesting that this capture implicit quirk is still needed. Maybe we can work around in a different way, but this addition would be likely simpler. Let's see whether any other devices need to follow this pattern, then we can rethink. In anyway, applied now. Thanks. Takashi