[alsa-devel] Enable HP machine to enable capture mute led and output mute led

[Kailang]

Hi Takashi,

Attach was HP mute led support patch.
It use Line1 vref and Mic1 vref to control mute led for ALC282.
Line1 vref to control output mute led.
Mic1 vref to control input mute led.

It use GPIO3 and Mic1 vref to control mute led for ALC280.
GPIO3 to control output mute led.
Mic1 vref to control input mute led.

For the DMI string for output mute led application.
I already request from HP to support it in next release.

HP_Mute_LED_0_A  => use Mic1 vref to control mute led.
Is the string right?
I have tested upper string for Mic1 mute led.

BR,
Kailang
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