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

Roy Lofthouse lofty69 at gmail.com
Mon Oct 5 20:23:42 UTC 2009


2009/10/5 James Crow <james at ultratans.com>:
> Roy Lofthouse wrote:
>>
>> 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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>>> mythtv-users at mythtv.org
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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).
>> _______________________________________________
>>
>
> SPDIF only requires 2 pins so three is ok. The only TV I have seen with a
> DVI input did not support sound over DVI. Are you sure the device you are
> connecting to support sounds over DVI?
>
> Cheers,
> James
>
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>

the TV and PC are currently connect via hdmi-hdmi, I'll try going out
of the DVI from the PC into the HDMI of the TV, that way it mirrors
your setup (although I'd be surprised if the HDMI is not passing the
audio, but I'll try anything at the moment).


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