[alsa-devel] Fix for Asus G75 notebook subwoofer

Massimo Del Fedele max at veneto.com
Wed Nov 7 18:02:20 CET 2012

Il 07/11/2012 16:54, Takashi Iwai ha scritto:
> It's OK, just missing the stereo capability check in the mixer code,
> but almost harmless.  Which channel (left or right) of "surround"
> mixer actually controls the volume of subwoofer on your machine?

Both, as the volume control is at DAC level and not at pin one.
aplay with channel test sound shows a 4 channels audio, driving
subwoofer with both rear left and rear right data.
If I lower left or right volume, just opposite channel goes to
I guess that mono mixing is done at widget 0x3e (the hidden one).


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