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

Raymond Yau superquad.vortex2 at gmail.com
Mon Apr 7 03:15:11 CEST 2014

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!


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


seem support 5.1 using two headphone jacks and mic jack

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