[mythtv-users] Nvidia 8400GS SPDIF/HDMI pass through.. how?

[Roy Lofthouse]

2009/10/5 James Crow <james at ultratans.com>:
> Roy Lofthouse wrote:
>>
>> 2009/10/5 jedi <jedi at mishnet.org>:
>>
>>>
>>> On Mon, Oct 05, 2009 at 04:31:08PM +0100, Roy Lofthouse wrote:
>>>
>>>>
>>>> I've been pulling my hair out at this for two days now, but I can't
>>>> seem to get my nvidia 8400GS to play sound via the HDMI.
>>>>
>>>> I've connected the cable that comes with it from the onboard SPDIF
>>>> header to the SPDIF (in) of the nv card, but I can't seem to get the
>>>> thing working..
>>>>
>>>> Maybe someone who has experience of this can help me out a bit?? :)
>>>>
>>>> Once the cable is connected I presume I should just set my sound to
>>>> play through the SPDIF connection?
>>>>
>>>> aplay -l shows the following:
>>>>
>>>> **** List of PLAYBACK Hardware Devices ****
>>>> card 0: Intel [HDA Intel], device 0: ALC880 Analog [ALC880 Analog]
>>>>  Subdevices: 1/1
>>>>  Subdevice #0: subdevice #0
>>>> card 0: Intel [HDA Intel], device 1: ALC880 Digital [ALC880 Digital]
>>>>  Subdevices: 1/1
>>>>  Subdevice #0: subdevice #0
>>>>
>>>> and I then run:
>>>>
>>>> mplayer -ao alsa:device=hw=0.2 <file> to try and test this, but
>>>> nothing happens.. (no errors initially when running this)
>>>>
>>>
>>> ...run alsamixer and make sure the HDMI output is not muted.
>>>
>>> [deletia]
>>>
>>>  Some times, it's just a simple thing.
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>>>
>>
>> Everything is unmuted (no HDMI option though, just IEC***)
>>
>
> Because you are passing the spdif audio to the nvidia card the iec958 _is_
> your hdmi audio. I have the exact same setup and I just set myth to output
> to ALSA:default and checked the options for AC3 and DTS passthrough. I have
> nothing connected to the analog sound outputs and only a DVI->HDMI cable
> connected. Audio plays through the TV speakers. I have no ~/.asoundrc or
> /etc/asoundrc and iec958 is unmuted. I have to use the TV remote to control
> sound. The output above from 'aplay -l' looks very much like mine. Try
> running 'aplay -L' not the _capital_ L. You should see the iec958 listed
> there.
>
> You also should double check the polarity of the SPDIF cable from the MB to
> the nvidia card. On my MB the SPDIF header is just 4 pins and it would be
> easy to have the plug backward.
>
> Cheers,
> James
>
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IEC958 does show in aplay -L

The only asound file I have is /etc/asound.state

I'm running a pure dvi cable, but will test with a dvi-hdmi cable
tomorrow.  I'm starting to think it's a hardware issue.  My SPDIF
header only has three pins and I went off the connector that was
already there (Black/Red and White wires).