From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from smtp-out1.suse.de (smtp-out1.suse.de [195.135.223.130])
	(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 0FDB32D8378;
	Fri,  9 Oct 2026 13:06:59 +0000 (UTC)
Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=195.135.223.130
ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116;
	t=1791551221; cv=none; b=I+Q8ir2D6xSgniopO/3t9HN4sFWbq3E93v6pYo+jSR5W5P4xibc4+MoPjwB7NyVt5F2Wj5Q7ZXS/G7um4CrNyPsicfQ3QDpuIiVY+loLY/LRRRGF3I/TaYGbtxYyNwbZlTiK64okwdmTMVjMUzIljFOLGkwPxAHrwjTdVjj5Whc=
ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org;
	s=arc-20240116; t=1791551221; c=relaxed/simple;
	bh=4iqX4CvMtOj9yjXsd2TdSfg942NUgO6LRv+HGNdGYt4=;
	h=Date:Message-ID:From:To:Cc:Subject:In-Reply-To:References:
	 MIME-Version:Content-Type; b=ClLR7RDiqDMW3wwv14nscfmbTtgR8fCuwDQQnKtYoOBA9v1gzxV65nDiMiM9sqv34CpvwN7bpUorYVZnrlp8kPe0+Ct36r5lyNyPEZ1ea8hcxrzwy089IIKoS99ljQcorP3WEJIXPdQfN7ky9ep9oM050kYWYBBIWZ+cpyDHiyc=
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; arc=none smtp.client-ip=195.135.223.130
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
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-out1.suse.de (Postfix) with ESMTPS id 0302621C26;
	Fri,  9 Oct 2026 13:06:58 +0000 (UTC)
Authentication-Results: smtp-out1.suse.de;
	none
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 A76FA1326D;
	Fri,  9 Oct 2026 13:06:57 +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 +b9XH/HmyGq2SQAAD6G6ig
	(envelope-from <tiwai@suse.de>); Fri, 09 Oct 2026 13:06:57 +0000
Date: Fri, 09 Oct 2026 15:06:57 +0200
Message-ID: <87pkxj3tvy.wl-tiwai@suse.de>
From: Takashi Iwai <tiwai@suse.de>
To: Olivier Kaloudoff <olivier.kaloudoff@gmail.com>
Cc: alsa-devel@alsa-project.org,
	tiwai@suse.com,
	perex@perex.cz,
	linux-usb@vger.kernel.org,
	stable@vger.kernel.org
Subject: Re: [PATCH] ALSA: usb-audio: Add mic resolution quirk for Logitech Webcam C200
In-Reply-To: <20261008230844.11246-1-olivier.kaloudoff@gmail.com>
References: <20261008230844.11246-1-olivier.kaloudoff@gmail.com>
User-Agent: Wanderlust/2.15.9 (Almost Unreal) Emacs/30.2 Mule/6.0
Precedence: bulk
X-Mailing-List: linux-usb@vger.kernel.org
List-Id: <linux-usb.vger.kernel.org>
List-Subscribe: <mailto:linux-usb+subscribe@vger.kernel.org>
List-Unsubscribe: <mailto:linux-usb+unsubscribe@vger.kernel.org>
MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue")
Content-Type: text/plain; charset=US-ASCII
X-Rspamd-Pre-Result: action=no action;
	module=Unknown lua;
	unknown reason
X-Spam-Flag: NO
X-Spamd-Bar: /
X-Rspamd-Queue-Id: 0302621C26
X-Rspamd-Pre-Result: action=no action;
	module=Unknown lua;
	unknown reason
X-Rspamd-Action: no action
X-Rspamd-Server: rspamd1.dmz-prg2.suse.org
X-Spam-Level: 
X-Spamd-Result: default: False [0.00 / 50.00];
	TAGGED_RCPT(0.00)[]
X-Spam-Score: 0.00

On Fri, 09 Oct 2026 01:08:44 +0200,
Olivier Kaloudoff wrote:
> 
> The C200 (046d:0802) reports a mic capture volume range of
> 1536..7680 with a resolution of 1 (6144 steps), triggering
> "Warning! Unlikely big volume step count (=6144), linear volume or
> wrong cval->res?" at probe and exposing a uselessly fine-grained
> mixer control.  This is the same firmware behavior as the other
> UVC-era Logitech webcams already carrying QUIRK_FLAG_MIC_RES_384
> (C500, C600, C210, C270, C310, C510, C525, ...), so apply the same
> quirk: CTL_MSG_DELAY_1M (which the Logitech VENDOR_FLG would provide
> if the device-specific entry did not short-circuit the lookup) plus
> MIC_RES_384.
> 
> Verified on real hardware: with the quirk the warning disappears and
> the driver logs "set resolution quirk: cval->res = 384".
> 
> Signed-off-by: Olivier Kaloudoff <olivier.kaloudoff@gmail.com>
> Cc: stable@vger.kernel.org

Applied to for-next branch now.  Thanks.


Takashi