From: sashiko-bot@kernel.org
To: "Olivier Kaloudoff" <olivier.kaloudoff@gmail.com>
Cc: linux-usb@vger.kernel.org
Subject: Re: [PATCH] ALSA: usb-audio: Add mic resolution quirk for Logitech Webcam C200
Date: Thu, 08 Oct 2026 23:12:09 +0000 [thread overview]
Message-ID: <sashiko-outbox-164655@kernel.org> (raw)
In-Reply-To: <20261008230844.11246-1-olivier.kaloudoff@gmail.com>
> 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>
Sashiko has reviewed this patch and found no issues. It looks great!
--
Sashiko AI review · https://sashiko.dev/#/patchset/20261008230844.11246-1-olivier.kaloudoff@gmail.com?part=1
next prev parent reply other threads:[~2026-10-08 23:12 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-08 23:08 [PATCH] ALSA: usb-audio: Add mic resolution quirk for Logitech Webcam C200 Olivier Kaloudoff
2026-10-08 23:12 ` sashiko-bot [this message]
2026-10-09 13:06 ` Takashi Iwai
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