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Thu, 08 Oct 2026 16:08:47 -0700 (PDT) Received: from localhost.localdomain ([2a0d:e487:415e:bf71:e574:69b7:f11e:4204]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4a18bead84esm14244115e9.13.2026.10.08.16.08.46 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Thu, 08 Oct 2026 16:08:46 -0700 (PDT) From: Olivier Kaloudoff To: alsa-devel@alsa-project.org Cc: tiwai@suse.com, perex@perex.cz, linux-usb@vger.kernel.org, Olivier Kaloudoff , stable@vger.kernel.org Subject: [PATCH] ALSA: usb-audio: Add mic resolution quirk for Logitech Webcam C200 Date: Fri, 9 Oct 2026 01:08:44 +0200 Message-ID: <20261008230844.11246-1-olivier.kaloudoff@gmail.com> X-Mailer: git-send-email 2.54.0 Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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 --- sound/usb/quirks.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c index c5870901a..16cb57f2c 100644 --- a/sound/usb/quirks.c +++ b/sound/usb/quirks.c @@ -2249,6 +2249,8 @@ 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 */ -- 2.47.3