Comment 67 for bug 1332900

(In reply to Gary from comment #26)
> (In reply to Raymond from comment #19)
> > use advanced override mode to change the pin default of node 0x1a
> >
> > and disable node 0x16 change [Jack] to [N/A] in order to assign DAC and
> > volume control to subwoofer
> >
> >
> > you need to set as boot default instead of dynamic reconfiguration
> >
> > speaker-test -Dhw:0,0 -c4 -t wav
> >
> >
> > to find out the subwoofer use left, right or both of rear channels
>
>
>
> I dont understand this Please explain ?
>
> use advanced override mode to change the pin default of node 0x1a
>
> With 0x16 put as not connected
> it wont allow me to do the sound test see below
>
> # speaker-test -Dhw:0,0 -c4 -t wav
>
> speaker-test 1.0.27.2
>
> Playback device is hw:0,0
> Stream parameters are 48000Hz, S16_LE, 4 channels
> WAV file(s)
> Channels count (4) not available for playbacks: Invalid argument
> Setting of hwparams failed: Invalid argument
>
> But I disconnected 0x15 and both left and right rear was coming out of the
> center Sub

you have to the output of alsa-info.sh after your retask

four chanels only available when

you have two speaker with same default assoc but different sequence after you disable node 0x16

or

two headphone jacks

change the node 0x1a to line out create pcm playback switch means your are not using latest alsa driver