[alsa-devel] Surround sound not working on ALC887 based motherboard

[Olivier Crête]

On Wed, 2014-01-15 at 15:35 +0800, Raymond Yau wrote:
> 
> 
> 
> 2014/1/15 Olivier Crête <olivier.crete at ocrete.ca>
>         Hi,
>         
>         
>         > >         I have a Asus P5G41T-M LX Plus motherboard which
>         is ICH7 +
>         > >         Realtek
>         > >         ALC887-VD, alsa only lets me access the first 2
>         channels
>         > >         (stereo), but
>         > >         not the 6 other ones. It works fine in Windows.
>         > >
>         > >         Trying to run this after killing pulseaudio fails:
>         > >
>         > >         $ aplay -D surround40:0 -f S16_LE -r 44100 -c
>         4 /dev/zero -v
>         > >         Playing raw data '/dev/zero' : Signed 16 bit
>         Little Endian,
>         > >         Rate 44100 Hz, Channels 4
>         > >         aplay: set_params:1239: Channels count non
>         available
>         > >
>         > >
>         > >         Output from alsa-info:
>         > >
>         http://www.alsa-project.org/db/?f=fe378d28f0dbb5a427b005d20866a762fd37d31a
>         >
>         > >
>         > > post output of pactl list or pulseaudio verbose log
>         >
>         > http://www.ocrete.ca/surround/pactl-list.txt
>         > http://www.ocrete.ca/surround/pulseaudio-vv.txt
>         >
>         > > you have to change channel mode from 2ch to 6ch to retask
>         the input
>         > > jacks as output if your motherboard only have three audio
>         jacks at
>         > > rear panel
>         >
>         > How would one do that ? Pulseaudio only offers Stereo
>         profiles.
>         
> 
> amixer -c0 set "Channel Mode" "6ch"
> 
> 
> >
> > > do you mean pulseaudio cannot probe the surroun40 or surround51
> > > profile ?
> >
> > Yes, but I can't use it with aplay even without pulseaudio running.
> >
> > > Simple mixer control 'Channel Mode',0
> > >   Capabilities: enum
> > >   Items: '2ch' '4ch' '6ch'
> > >   Item0: '2ch'
> >
> >
> 
> 
> > For some reason didn't get your last email, but I saw I saw it on
> the
> > archive.. Thanks for your solution, it worked! Definitely something
> > PulseAudio should expose better.
> 
> 
> 
> 
> do it really work since rear mic become active port even when it had
> been retasked as output ?

The 6 outputs work at the same time. I didn't try it as a mic as I don't
have a mic here...

> Ports:
> 		analog-input-front-mic: Front Microphone (priority: 8500, not available)
> 		analog-input-rear-mic: Rear Microphone (priority: 8200, available)
> 		analog-input-linein: Line In (priority: 8100, available)
> 	Active Port: analog-input-rear-mic


-- 
Olivier Crête
olivier.crete at ocrete.ca
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