[alsa-devel] 2.1 audio not working in Kubuntu 13.10

[Raymond Yau]

2014-04-03 2:44 GMT+08:00 Tomas Black <tomas.black at gmail.com>:

> Dear friends,
>
>
> I have a Dell L702X laptop which comes with a 2.1 sound configuration - 2
> speakers + subwoofer from JBL. Sound is suberb in Windows, but  I can't get
> the subwoofer to work in Linux!
>

http://www.realtek.com/products/productsView.aspx?Langid=1&PFid=37&Level=5&Conn=4&ProdID=252

Take a look at datasheet,

ALC655 is a 5.1 codec and a MONO out

either the subwoofer is at the MONO node 0x17  or the right or left
channels of the other unconnected stereo nodes

try hdajackretask to change the pin default of node 0x17 to [Fixed] Speaker
at Int


http://en.community.dell.com/support-forums/laptop/f/3517/t/19440542.aspx

seem support 5.1 using two headphone jacks and mic jack