[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>

> 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
>>
> Maybe - I'm not pretending I've seen all possible configurations. Since the
> idea I'm discussing is to just add some new models for several laptops with
> subwoffers, ultimately it doesn't matter which pin has the subwoofer
> connected, it just have to be correct pin for a given laptop family (0x17
> for mine, whatever corresponds to Master Mono for someone else's etc).


https://bugtrack.alsa-project.org/alsa-bug/view.php?id=5031

The Dell XPS M1710 has 2.1 speakers with volume controls on both stereo
speakers and Subwoofer,

Node 0x11 [Pin Complex] wcaps 0x400104: Mono Amp-Out
  Amp-Out caps: N/A
  Amp-Out vals: [0x00]
  Pincap 0x00000010: OUT
  Pin Default 0x90170311: [Fixed] Speaker at Int N/A
    Conn = Analog, Color = Unknown
    DefAssociation = 0x1, Sequence = 0x1
    Misc = NO_PRESENCE
  Pin-ctls: 0x40: OUT
  Connection: 1
     0x13