ALC850 on nvidia MCP04 chipset using more than 2 speakers...

[fred]

Hi the list,

My Asus P5ND2-SLI Deluxe mobo (nForce4 MCP04 chipset) has an ALC850 
sound chipset by Realtek.
With a little patch (kern/106829), that works fine.
Almost fine.

One can use output on at least 4 channels (2 front speakers  and  2 rear 
speakers).
The fact is that only the 2 front speakers work. There is no sound on 
the 2 rear.

I use aumix, or mixer :
Mixer vol      is currently set to 100:100
Mixer pcm      is currently set to 100:100
Mixer speaker  is currently set to  75:75
Mixer line     is currently set to  75:75
Mixer mic      is currently set to   0:0
Mixer cd       is currently set to  75:75
Mixer rec      is currently set to   0:0
Mixer igain    is currently set to 100:100
Mixer ogain    is currently set to 100:100
Mixer line1    is currently set to 100:100
Mixer phin     is currently set to 100:100
Mixer phout    is currently set to 100:100
Recording source: mic

and it sounds not so bad.

How can one fix it ?

Thanks in advance.


Cheers,

-- 
http://scipy.org/FredericPetit