AUSUS M472-E (VT1708S) & SPDIF

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Hi guys

This is my first message in a mailing list ever and as you may see from 
this fact, I'm a Linux noob.
I have posted my problem here: 
http://ubuntuforums.org/showthread.php?p=7700857#post7700857
But after I didn't get a lot of help I'm wiriting this message now.
I have searched the internet for some days and hope to get help on this 
way...

I worked with Ubuntu on my laptop for some years now and have built a HTPC.


My system:
Mainboard M4N72-E with onboard VIA VT1708S soundchip.
Operating System is Mythbuntu 9.04 AMD64.
Kernel 2.6.28-14-generic
ALSA Version 1.0.20


I want to get the sound to my 5.1 system over SPDIF. It worked 
occasionally but not reproducible.


To solve the problem I have followed this: 
http://www.mythtv.org/wiki/AllensDigitalAudioHowto

aplay -l:
card 0: NVidia [HDA NVidia], device 0: VT1708S Analog [VT1708S Analog]
  Subdevices: 2/2
  Subdevice #0: subdevice #0
  Subdevice #1: subdevice #1
card 0: NVidia [HDA NVidia], device 1: VT1708S Digital [VT1708S Digital]
  Subdevices: 2/2
  Subdevice #0: subdevice #0
  Subdevice #1: subdevice #1

aplay -L:
front:CARD=NVidia,DEV=0
    HDA NVidia, VT1708S Analog
    Front speakers
surround40:CARD=NVidia,DEV=0
    HDA NVidia, VT1708S Analog
    4.0 Surround output to Front and Rear speakers
surround41:CARD=NVidia,DEV=0
    HDA NVidia, VT1708S Analog
    4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=NVidia,DEV=0
    HDA NVidia, VT1708S Analog
    5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=NVidia,DEV=0
    HDA NVidia, VT1708S Analog
    5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=NVidia,DEV=0
    HDA NVidia, VT1708S Analog
    7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
iec958:CARD=NVidia,DEV=0
    HDA NVidia, VT1708S Digital
    IEC958 (S/PDIF) Digital Audio Output
null
    Discard all samples (playback) or generate zero samples (capture)


In alsamixer I have turned each volume up and checked three IEC958 boxes.

This is the content in my "/etc/asound.conf":
  pcm.!default {
     type plug
     slave {
        pcm "hw:0,1"
        format S32_LE
     }
  }

It worked with it two or three times but at the latest after rebooting 
it didn't work anymore.


Is this a known problem of the soundchip or is the problem sitting 
behind the screen?


Cheers
Ramon

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