[alsa-devel] [PATCH] ALSA: hda: Add speaker pin to automute Acer Aspire 8943G

[Raymond Yau]

2010/10/14 Valentine Sinitsyn <valentine.sinitsyn at gmail.com>

> Do you mean that you want to add that "subwoofer" control which is
>> connected
>> the the master mono pin of the codec  to the slave controls of the virtual
>> master volume control ?
>>
> Yes, except "subwoofer" control is to be connected to subwoofer's own pin
> (for instance, 0x17 on Lenovo machines). Subwoofer pins I've seen so far
> have their own output amplifier with mute.
>

There are laptop which has 2.1 speakers which subwoofer is connected to
master mono pin of the STAC codec  , The ".1" subwoofer is most likely the
result of a Low pass filter attached to the mono pin

Seem that your Lenovo are not using ALC670,  it is hard to make any comment
without knowing the output of alsa-info.sh