[mythtv-users] OT: Getting multi-speaker sound with intel audio

[Paul Catchpole]

If you've got the card working at all with ALSA under Linux, then try 
using the speaker-test program which is part of Alsa to test each 
channel whilst using the ALSA:surround51 predefined device. With some 
luck, it shouldn't need more than that.

If you then want to upmix 2-channel sound to appear from all five 
speakers at once, then look at something like this in your asound.conf:

pcm.fakerear {
        type route
        slave.pcm surround51
slave.channels 6
#Front left and right :
ttable.0.0 0.9
ttable.1.1 0.9
#center:
ttable.0.4 0.9
ttable.1.4 0.9
#Bass:
ttable.1.5 0.5
ttable.0.5 0.5
#Rear Left:
ttable.0.2 0.6
#Rear Right:
ttable.1.3 0.6

}

Hope that helps,

Paul

PS: The above is for an SBLive, although it should work, possibly 
needing a change to the ordering of channels to get the right speakers 
working at the right times!

Marc Barrett wrote:
>    I am using an intel motherboard with built-in audio. 
> Windoze reports it as a c-media "X-ear3D" audio controller, 
> with a CMI9739A codec. Linux lspci reports it as an intel 
> "82801EB/ER (ICH5/ICH5R) AC'97 Audio Controller."
>
>    Anyway, under Windoze, I can use the microphone and line-in
> ports for additional speakers, to use up to 6 speakers at once. I 
> am wondering if this is possible under Linux.  I am not all that 
> good at setting up ALSA.
>
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