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

Olivier Crête olivier.crete at ocrete.ca
Mon Jan 13 21:12:30 CET 2014


On Mon, 2014-01-13 at 18:16 +0800, Raymond Yau wrote:

> 2014/1/10 Olivier Crête <olivier.crete at ocrete.ca>
>         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 


> 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.

> 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'

Olivier Crête
olivier.crete at ocrete.ca

More information about the Alsa-devel mailing list