Der onboard Soundchip funktionierte auf Anhieb mit dem snd_intel8x0 ALSA Treiber. Was noch ein wenig der Konfiguration bedarf ist die Aktivierung des optischen SPDIF Ausganges zum Anschluss an meinen Dolby Digital Receiver. Das ermöglicht eine verlustfreie Übertragung der Audiodaten und somit einen glasklaren Klang. Beim Abspielen von DVDs und anderen AC3 Quellen erspart man damit dem Rechner ausßerdem das Dekodieren des AC3 Signals. Es wird mittels AC3 Passthrough einfach unverändert auf dem SPDIF Ausgang ausgegeben.

1. .asoundrc

   # Override the default output used by ALSA.
   # If you do not override the default, your default
   # device is identical to the (unmixed) analog device
   # shown below.  If you prefer mixed and/or digital
   # output, uncomment the appropriate four lines below
   # (only one slave.pcm line).
   pcm.!default {
     type plug
   ## Uncomment the following to use mixed analog by default
   #  slave.pcm "dmix-analog"
   ## Uncomment the following to use unmixed digital by default
   #  slave.pcm "digital-hw"
   ## Uncomment the following to use mixed digital by default
     slave.pcm "dmix-digital"
   }
   
   # Alias for analog output on the nForce2/4 (hw:0,0)
   # - This is identical to the device named "default"--which
   # always exists and refers to hw:0,0 (unless overridden)
   # - Therefore, we can specify "hw:0,0", "default", or "analog"
   # to access analog output on the nForce2/4
   pcm.analog {
    type plug
    slave.pcm "analog-hw"
   }
   
   # Control device (mixer, etc.) for the nForce2 card
   ctl.analog {
    type hw
    card 0
   }
   
   # Alias for (rate-converted) mixed analog output on the
   # nForce2 (hw:0,0)
   #  - This will accept audio input--regardless of rate--and
   # convert to the rate required for the dmix plugin
   # (in this case 48000Hz)
   pcm.mixed-analog {
    type plug
    slave.pcm "dmix-analog"
   }
   
   # Control device (mixer, etc.) for the nForce2 card
   ctl.mixed-analog {
    type hw
    card 0
   }
   
   # Alias for (rate-converted) digital (S/PDIF) output on the
   # nForce2 (hw:0,2)
   #  - This will accept audio input--regardless of rate--and
   # convert to the rate required for the S/PDIF hardware
   # (in this case 48000Hz)
   pcm.digital {
    type plug
    slave.pcm "digital-hw"
   }
   
   # Control device (mixer, etc.) for the nForce2 card
   ctl.digital {
    type hw
    card 0
   }
   
   # Alias for mixed (rate-converted) digital (S/PDIF) output on the
   # nForce2/4 (hw:0,2)
   #  - This will accept audio input--regardless of rate--and
   # convert to the rate required for the S/PDIF hardware
   # (in this case 48000Hz)
   pcm.mixed-digital {
    type plug
    slave.pcm "dmix-digital"
   }
   
   # Control device (mixer, etc.) for the nForce2 card
   ctl.mixed-digital {
    type hw
    card 0
   }
   
   # The following devices are not useful by themselves.  They
   # require specific rates, channels, and formats.  Therefore,
   # you probably do not want to use them directly.  Instead use
   # one of the devices defined above.
   
   # Alias for analog output on the nForce2 (hw:0,0)
   # Do not use this directly--it requires specific rate,
   # channels, and format
   pcm.analog-hw {
    type hw
    card 0
    # The default value for device is 0, so no need to specify
   }
   
   # Control device (mixer, etc.) for the nForce2/4 card
   ctl.analog-hw {
    type hw
    card 0
   }
   
   # Alias for digital (S/PDIF) output on the nForce2/4 (hw:0,2)
   # Do not use this directly--it requires specific rate,
   # channels, and format
   pcm.digital-hw {
    type hw
    card 0
    device 4
   }
   
   # Control device (mixer, etc.) for the nForce2/4 card
   ctl.digital-hw {
    type hw
    card 0
   }
   
   # Direct software mixing plugin for analog output on
   # the nForce2/4 (hw:0,0)
   # Do not use this directly--it requires specific rate,
   # channels, and format
   pcm.dmix-analog {
    type dmix
    ipc_key 1234
    slave {
      pcm "analog-hw"
      period_time 0
      period_size 1024
      buffer_size 4096
      rate 48000
    }
   }
   
   # Control device (mixer, etc.) for the nForce2/4 card
   ctl.dmix-analog {
    type hw
    card 0
   }
   
   # Direct software mixing plugin for digital (S/PDIF) output
   # on the nForce2/4 (hw:0,2)
   # Do not use this directly--it requires specific rate,
   # channels, and format
   pcm.dmix-digital {
    type dmix
    ipc_key 1235
    slave {
      pcm "digital-hw"
      period_time 0
      period_size 1024
      buffer_size 4096
      rate 48000
    }
   }
   
   # Control device (mixer, etc.) for the nForce2/4 card
   ctl.dmix-digital {
    type hw
    card 0
   }
   
         

2. Testen
   

    
   xccube:/usr/src # aplay test.wav
         

TODO