[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>

> Hi David,
>
> First of all, thank you for your work on subwoofer issues.


it seem that acer aspire 8943g has 5.1 speakers according to acer web site

with five built-in speakers and one subwoofer supporting low-frequency
effects

https://bugtrack.alsa-project.org/alsa-bug/view.php?id=5083

alc670 is a 6 channels codec with [Audio Output] at nodes 0x02, 0x03 and
0x04

http://www.alsa-project.org/db/?f=d1c9aaa11903b6b1e2fd87b6d0466157ffdcb6ad


Seem that your Lenovo are not using ALC670,
>
Nope it doesn't. It is Lenovo Y550P with ALC272, and in my system, the
subwoofer is connected at pin 0x17. I'm not at it at the moment, but I can
send alsa-info.sh later if it is of any interest.

 ALC272 is just a four channels codec ,

If you look at the block diagram (page 5) of alc272 datasheet , the mono-out
(Port H) pin 0x17 has no volume control , and it is connected through 0x0f
to [Audio Output] node 0x02.

This is quite different from STAC9200 which has a volume control for the
mono-out widget

The beep-in and the beep generator can connected to 0x0f through [Audio
Mixer] 0x0b
this mean that the driver cannot assume that master-mono must be connected
to a subwoofer.