From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794063236; b=YeQfYO2qrklNawWh2LCh98rReQcD6Ewh5jLMXh0A29x3N2M8Ln5kG94OqwVdr1lEk1Ct NeFPEez4KRBHdJzeTsub8lYt6VaOthFVbCjbhS01NNBUshDtTrnHtxMQzZYh4qAwwM/oU rFUCpbMV2tCzuSGoQeeCD3jPVfiZ7rpjFX5fcZrki36az3lofwcEFW0UZnK69F9NKUwYy ZjOwd1w/1p+YoVlR7A2G+zPRxFlsneLVv5V1FO4PmQsc55s47QGl9Wi8JzwgN0Ipdheny y7aX9B6A9bv+z5yCQSpu4Jz+LOX+LMbS8MGKiaBb1cWDxr7XHDHeSTvXEN2ogShBaiA== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794063236; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:User-Agent:X-stable:X-Patchwork-Hint: MIME-Version:Content-Transfer-Encoding; bh=C4D3MpxMF6whqhCTuMXkAGSuquJvQHZ4tpoEeJsG19s=; b=yp8v0rGJoMQrRKYa9Unh5SDclYaUIlnEtiQBxhCCvJZxV0ugawKenDh6zTuw+5OU3tJU IpIKhE7cmm22Pb/Ow+BytfAfsHfDzDKcHb0Tf6R7L1wGyCyBrylUYDARNTGWW0x4+hHE8 r1UnEwQZKa1W9WHV6ihqd5eQhhQAYzY5YMCAX9gaWbej2z+diAjPJrhMxFy4Viz7GFWJm 6xpHeoxQMHEw3rndMpxLIsdxDZ2TrEHPgc0trpHSrDd5dD6iUi2/BvA6ciRIsgUzJOCEN IFbpGtPFxudaGUoeAHThftDzyAwb/qeOQOKxtJsX5nlBHZQcuwdzRcT1Ig+tWBfirew== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b="wA6dWQM/"; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 84D41606A333; Sat, 7 Nov 2026 14:53:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=wA6dWQM/ Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2EE401F008A1; Sat, 7 Nov 2026 14:53:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1794063236; bh=C4D3MpxMF6whqhCTuMXkAGSuquJvQHZ4tpoEeJsG19s=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=wA6dWQM/jmlm4+2VrfyOEq0+r3sPTUqG98jPembDobUky1T14aoFRCe5+QwHsZrv6 pJ00tpu7+L0xbEHqaxoMOW/PKbk78CQh0bLdpIFReYnSL0cIhN+TcOBK1yPBVhgCkV Wk/mmwgmIuDClUWUFagY8XKIIvY2eVDD0aoil8DE= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Olivier Kaloudoff , Takashi Iwai , Sasha Levin Subject: [PATCH 6.18 443/869] ALSA: usb-audio: Add mic resolution quirk for Logitech Webcam C200 Date: Sat, 7 Nov 2026 08:52:05 -0500 Message-ID: <20261107134908.777101091@linuxfoundation.org> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261107134852.069646174@linuxfoundation.org> References: <20261107134852.069646174@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore X-Mailing-List: stable@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Olivier Kaloudoff [ Upstream commit 874323b68c93c6808e034dc0113681e822e6fb42 ] 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 Cc: stable@vger.kernel.org Link: https://patch.msgid.link/20261008230844.11246-1-olivier.kaloudoff@gmail.com Signed-off-by: Takashi Iwai Signed-off-by: Sasha Levin --- sound/usb/quirks.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c index be80d9d14e0ad..01a5564eda7af 100644 --- a/sound/usb/quirks.c +++ b/sound/usb/quirks.c @@ -2161,6 +2161,8 @@ static const struct usb_audio_quirk_flags_table quirk_flags_table[] = { QUIRK_FLAG_DISABLE_AUTOSUSPEND), DEVICE_FLG(0x045e, 0x070f, /* MS LifeChat LX-3000 Headset */ QUIRK_FLAG_MIXER_PLAYBACK_MIN_MUTE), + DEVICE_FLG(0x046d, 0x0802, /* Logitech Webcam C200 */ + QUIRK_FLAG_CTL_MSG_DELAY_1M | QUIRK_FLAG_MIC_RES_384), DEVICE_FLG(0x046d, 0x0807, /* Logitech Webcam C500 */ QUIRK_FLAG_CTL_MSG_DELAY_1M | QUIRK_FLAG_MIC_RES_384), DEVICE_FLG(0x046d, 0x0808, /* Logitech Webcam C600 */ -- 2.53.0