2-ch from SPDIF works, AC3 passthrough doesn't on ICE1724

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Hello,

I am trying to get AC3 passthrough via SPDIF working with Xine, but having a hard time.   Currently, my setup works when playing two channel audio to the device 'plughw:0,1' (my SPDIF device is device 1 on card 0)) -- I can use Speaker-test, play MP3's, and play DVD's in Stereo, all with excellent sound quality.

However, when enable passthrough to plughw:0,1 or the iec958 device, I hear no sound at all.  Using aplay with a Dolby Digital test sound also doesn't produce any output.

I have tried a number of /etc/asound.conf files listed on SPDIF howtos, but none seem to allow for passthrough playback (so I currently don't have one installed).  Any suggestions are appreciated.

Some info about my system: (Gentoo, Kernel 2.4.23-r9, Alsa 1.0.16)

joe@jgsmyth ~ $ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: ICE1724 [ICEnsemble ICE1724], device 0: ICE1724 [ICE1724]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: ICE1724 [ICEnsemble ICE1724], device 1: IEC1724 IEC958 [IEC1724 IEC958]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

joe@jgsmyth ~ $ aplay -L
default:CARD=ICE1724
    ICEnsemble ICE1724, ICE1724
    Default Audio Device
front:CARD=ICE1724,DEV=0
    ICEnsemble ICE1724, ICE1724
    Front speakers
rear:CARD=ICE1724,DEV=0
    ICEnsemble ICE1724
    Rear speakers
center_lfe:CARD=ICE1724,DEV=0
    ICEnsemble ICE1724
    Center and Subwoofer speakers
side:CARD=ICE1724,DEV=0
    ICEnsemble ICE1724
    Side speakers
surround40:CARD=ICE1724,DEV=0
    ICEnsemble ICE1724, ICE1724
    4.0 Surround output to Front and Rear speakers
surround41:CARD=ICE1724,DEV=0
    ICEnsemble ICE1724, ICE1724
    4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=ICE1724,DEV=0
    ICEnsemble ICE1724, ICE1724
    5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=ICE1724,DEV=0
    ICEnsemble ICE1724, ICE1724
    5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=ICE1724,DEV=0
    ICEnsemble ICE1724, ICE1724
    7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
iec958:CARD=ICE1724,DEV=0
    ICEnsemble ICE1724, ICE1724
    IEC958 (S/PDIF) Digital Audio Output
null
    Discard all samples (playback) or generate zero samples (capture)
default:CARD=PXTV402
    Plextor PX-TV402,
    Default Audio Device
default:CARD=PXTV402_1
    Plextor PX-TV402,
    Default Audio Device


      

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