linux-kernel - Re: [PATCH] ALSA: usb-audio: Disable Lenovo P620 Rear line-in volume control

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Date:   Mon, 10 Aug 2020 16:03:19 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     Kai-Heng Feng <kai.heng.feng@...onical.com>
Cc:     tiwai@...e.com, Jaroslav Kysela <perex@...ex.cz>,
        "Alexander A. Klimov" <grandmaster@...klimov.de>,
        Andrew Oakley <andrew@...akley.name>,
        Chris Boyle <chris@...le.name>,
        alsa-devel@...a-project.org (moderated list:SOUND),
        linux-kernel@...r.kernel.org (open list)
Subject: Re: [PATCH] ALSA: usb-audio: Disable Lenovo P620 Rear line-in volume control

On Mon, 10 Aug 2020 15:31:06 +0200,
Kai-Heng Feng wrote:
> 
> The USB device (0x17aa:0x1046) that support Lenovo P620 rear panel
> line-in claim to support volume control, but it doens't seem to have an
> AMP, so when line-in volume lowers below 80, nothing gets recorded
> anymore.
> 
> Disable the volume control to workaround the issue.
> 
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>

Thanks, applied.


Takashi