[alsa-devel] [PATCH] - ALSA hda ad1988 - Add Independent HP Switch to model 6stack-dig-fp

[Raymond Yau]

2011/4/28 Takashi Iwai <tiwai at suse.de>


> > As for the upmixing feature, I wonder why no one complain about sending
> left
> > channel to the center and right channel to subwoofer
>
> Well, maybe because usually you set up 5.1 properly when you have such
> systems, then upmixing right in the backend, not in the driver.
>
>
I  have Creative 4.1 speakers which only has green and black jacks.

Refer to commit d29240ce57d96db7300360d1e6f18357810a5c2b

hda-intel driver unconditionally assigns the stream to multiple output pins
in copy-front mode

I can hear the stereo in all 4 jacks in rear panel because of copy-front
mode even in OSS emulation

This is why ad1988 still can use "Headphone Playback Volume" at DAC0 when
switch off "independent Headphone"f