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
Date: Fri, 09 Oct 2026 15:06:57 +0200 [thread overview]
Message-ID: <87pkxj3tvy.wl-tiwai@suse.de> (raw)
In-Reply-To: <20261008230844.11246-1-olivier.kaloudoff@gmail.com>
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
prev parent reply other threads:[~2026-10-09 13:06 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
2026-10-09 13:06 ` Takashi Iwai [this message]
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