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No stereo sound via HDMI


My setup: XBMCBuntu 11.0 Eden, Zbox ID80 HDMI -> Pioneer VSX-1121K receiver -> Samsung LED TV (HDMI)
I also added an optical TOSLINK cable for S/PDIF (more on this later) to experiment

I'm a XBMI newbie, but a Linux old timer. Love XBMC, but I'm pulling my hair out trying to:
1. Get stereo sound working. Currently all DD 5.1 and DTS videos work over HDMI, but anything with 2.0 stereo has NO sound when played, including MP3 and menu sounds.
2. HDMI sometimes gives static sound, so I tried to hook up an optical S/PDIF, and tried configuring output to "custom hw:0,1" but absolutely no sound comes through S/PDIF... I tinkered with .asoundrc with no success, so I removed .asoundrc

Please help... thanks in advance.

XBMC Audio Output
=================
Audio Output: HDMI
Speaker Config 5.1
Boost volume on downmix: yes
Dolby Digital AC3 receiver: yes
DTS receiver: yes
Audio Output device: custom, hw:1,3
Passthrough output device: custom, hw:1,3

Output of "aplay -l"
Code:
**** List of PLAYBACK Hardware Devices ****
card 0: Intel [HDA Intel], device 0: ALC892 Analog [ALC892 Analog]
  Subdevices: 0/1
  Subdevice #0: subdevice #0
card 0: Intel [HDA Intel], device 1: ALC892 Digital [ALC892 Digital]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: NVidia [HDA NVidia], device 3: HDMI 0 [HDMI 0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

Output of "aplay -L"
Code:
null
    Discard all samples (playback) or generate zero samples (capture)
default:CARD=Intel
    HDA Intel, ALC892 Analog
    Default Audio Device
front:CARD=Intel,DEV=0
    HDA Intel, ALC892 Analog
    Front speakers
surround40:CARD=Intel,DEV=0
    HDA Intel, ALC892 Analog
    4.0 Surround output to Front and Rear speakers
surround41:CARD=Intel,DEV=0
    HDA Intel, ALC892 Analog
    4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=Intel,DEV=0
    HDA Intel, ALC892 Analog
    5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=Intel,DEV=0
    HDA Intel, ALC892 Analog
    5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=Intel,DEV=0
    HDA Intel, ALC892 Analog
    7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
iec958:CARD=Intel,DEV=0
    HDA Intel, ALC892 Digital
    IEC958 (S/PDIF) Digital Audio Output
dmix:CARD=Intel,DEV=0
    HDA Intel, ALC892 Analog
    Direct sample mixing device
dmix:CARD=Intel,DEV=1
    HDA Intel, ALC892 Digital
    Direct sample mixing device
dsnoop:CARD=Intel,DEV=0
    HDA Intel, ALC892 Analog
    Direct sample snooping device
dsnoop:CARD=Intel,DEV=1
    HDA Intel, ALC892 Digital
    Direct sample snooping device
hw:CARD=Intel,DEV=0
    HDA Intel, ALC892 Analog
    Direct hardware device without any conversions
hw:CARD=Intel,DEV=1
    HDA Intel, ALC892 Digital
    Direct hardware device without any conversions
plughw:CARD=Intel,DEV=0
    HDA Intel, ALC892 Analog
    Hardware device with all software conversions
plughw:CARD=Intel,DEV=1
    HDA Intel, ALC892 Digital
    Hardware device with all software conversions
hdmi:CARD=NVidia,DEV=0
    HDA NVidia, HDMI 0
    HDMI Audio Output
dmix:CARD=NVidia,DEV=3
    HDA NVidia, HDMI 0
    Direct sample mixing device
dsnoop:CARD=NVidia,DEV=3
    HDA NVidia, HDMI 0
    Direct sample snooping device
hw:CARD=NVidia,DEV=3
    HDA NVidia, HDMI 0
    Direct hardware device without any conversions
plughw:CARD=NVidia,DEV=3
    HDA NVidia, HDMI 0
    Hardware device with all software conversions