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=1794326678; b=4Cvw7DkS8ZKIgnNn/wpyAoSu9D3n+nrxtfetxRpO2069J6v8K4O3qjQFLzhvh9LRSydm HfzjOSFXCxxcdEL8P8AKOLcWdpNl9eztioXJ1fK13eyIgN5Xiypa2FqtoLYB1qj0+1Jqr H91CJCWzD7CsUWsmLh5RUOPHgqJOlbWluF1EV2Br0saGAiw205JIYUmqAsFdVqi0Vx7HT /MiGgQniJebGwg1vjGv5poN9ICEptAFp/NSVbzebPQrrVJiA812fgT1yYpvirYzO03ef8 x7lbOarV6M6H+k+nxn0Q5JbZre3FhkFsEnloiylK6X+0p1O+LGgIFnDaYUQYc4fV7WQ== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794326678; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:MIME-Version:Content-Transfer-Encoding; bh=i97+GIW9Hh9sCNQH9Swro3UvlSWHzf/UNcjDp3k7ORo=; b=wW9VcuF83eKpEx+m3Z+S545tzDYghdwHAxqC0EW8Bdt6ShEQGfpDSjNRJ+mVuOszHnFX TvzS/tFxXOTSCKT/poRt83cDZZb0u2T7iFU6m08X3knFVmyPkevP8dyDDFsMcjnKRuADN xQdC1LToq2chVgm7KVYT/4kVtcDuIDYGO9WuUS/4oQGIGSg+20t16/ag1zfG5lgmWFA88 gGdapqzYaCxzLO0myMTSWRWynC2hz6HlnJvKRwHoc7a2cbXCj6H3aufCqbUu351JK/aPw 3KPZGwSe3paqGqcxkL4YY0oWsBQrCBQ8K3JuiawCBw0u4eR+XMS+zmo0dyK6i+LAOWA== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=FFj7hNjZ; 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 47D1E606A325 for ; Tue, 10 Nov 2026 16:04:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=FFj7hNjZ Received: by smtp.kernel.org (Postfix) with ESMTPSA id 43D1F1F0089F; Tue, 10 Nov 2026 16:04:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1794326677; bh=i97+GIW9Hh9sCNQH9Swro3UvlSWHzf/UNcjDp3k7ORo=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=FFj7hNjZcyPa+SzH/HyMHanEOBv1Z/gSb0c2wjx6ZmsDrZ6+0nRCJJPTZMWLWYd7U r2PqQbzq3G6NgbcwHVHxdxRI6e3adRSngMzNiAbrQxFitz2HuVXL1NcdspgEtRIXqD IUOxEUzVY+VeKSqtfwBpW0hpTiRPsAKB1DW6ZyWu0fYzRolQ868Pn8ADbhZ1RZmiCh PyXxBhbVSQ6qIxgWQpMdkA+3bH3lIjS4zyXcqawO2+uI8V898c2b58kwt5RXCjL4fY LwkPZ8Ufpd4FpHmfAD+6QEIF23kc4CnarPc4jUo7X63c4bPcOdmKhq4MGjdLnk4MUl KlWLpDeyQ5FcQ== From: Sasha Levin To: stable@vger.kernel.org Cc: Olivier Kaloudoff , Takashi Iwai , Sasha Levin Subject: [PATCH 5.10.y] ALSA: usb-audio: Add mic resolution quirk for Logitech Webcam C200 Date: Tue, 10 Nov 2026 11:04:35 -0500 Message-ID: <20261110160421.2032791-1-sashal@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20261107062007-failed-5.10-874323b68c93@kernel.org> References: <20261107062007-failed-5.10-874323b68c93@kernel.org> 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 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 [ sashal: Replaced the quirk flag table entry with a USB_ID case in volume_control_quirks(). ] Signed-off-by: Sasha Levin --- sound/usb/mixer.c | 1 + 1 file changed, 1 insertion(+) diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c index 7f64199139d31..48178272bf422 100644 --- a/sound/usb/mixer.c +++ b/sound/usb/mixer.c @@ -1163,6 +1163,7 @@ static void volume_control_quirks(struct usb_mixer_elem_info *cval, } break; + case USB_ID(0x046d, 0x0802): /* Logitech Webcam C200 */ case USB_ID(0x046d, 0x0807): /* Logitech Webcam C500 */ case USB_ID(0x046d, 0x0808): case USB_ID(0x046d, 0x0809): -- 2.53.0