At Wed, 07 Nov 2012 18:02:20 +0100, Massimo Del Fedele wrote:
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.
OK, it must be because of the DAC amp being stereo.
aplay with channel test sound shows a 4 channels audio, driving subwoofer with both rear left and rear right data.
Yes, this is still a missing piece. The driver needs an override to the standard chmap.
If I lower left or right volume, just opposite channel goes to subwoofer. I guess that mono mixing is done at widget 0x3e (the hidden one).
Takashi