[PATCH] ALSA: usb: mixer: volume quirk for ESS Technology Asus USB DAC

[Takashi Iwai]

On Tue, 26 May 2020 08:26:13 +0200,
Chris Chiu wrote:
> 
> The Asus USB DAC is a USB type-C audio dongle for connecting to
> the headset and headphone. The volume minimum value -23040 which
> is 0xa600 in hexadecimal with the resolution value 1 indicates
> this should be endianness issue caused by the firmware bug. Add
> a volume quirk to fix the volume control problem.
> 
> Also fixes this warning:
>   Warning! Unlikely big volume range (=23040), cval->res is probably wrong.
>   [5] FU [Headset Capture Volume] ch = 1, val = -23040/0/1
>   Warning! Unlikely big volume range (=23040), cval->res is probably wrong.
>   [7] FU [Headset Playback Volume] ch = 1, val = -23040/0/1
> 
> Signed-off-by: Chris Chiu <chiu at endlessm.com>

Applied with Cc to stable now.  Thanks.


Takashi