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HDMI and analog audio and Vizio

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finlay at moeraki

Nov 9, 2009, 7:39 AM

Post #1 of 4 (1295 views)
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HDMI and analog audio and Vizio

I have a Vizio DFP TV that I conect to my mythtv system using HDMI
(adapter) from a Nvidia 8600GT using DVI. I think that card has the
capability to convey digital audio but I'm not using that. Instead I am
using analog audio out to the TV. But it seems that the TV is not using
the analog input and (I speculate) expecting digital audio via the HDMI.
There is no setting in the TV to force using the analog audio input. I
have tried the procedure outlined in
http://www.mythtv.org/wiki/Configuring_Analog_Sound_DVI_to_HDMI to try
force the card to not send a null digital audio signal but the Vizio
still won't use the analog input. Is there anything else I should be
looking at to get the analog input to work?

john
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allen.p.edwards at gmail

Nov 9, 2009, 8:19 AM

Post #2 of 4 (1251 views)
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Re: HDMI and analog audio and Vizio [In reply to]

On Mon, Nov 9, 2009 at 7:39 AM, John Finlay <finlay [at] moeraki> wrote:

> I have a Vizio DFP TV that I conect to my mythtv system using HDMI
> (adapter) from a Nvidia 8600GT using DVI. I think that card has the
> capability to convey digital audio but I'm not using that. Instead I am
> using analog audio out to the TV. But it seems that the TV is not using the
> analog input and (I speculate) expecting digital audio via the HDMI. There
> is no setting in the TV to force using the analog audio input. I have tried
> the procedure outlined in
> http://www.mythtv.org/wiki/Configuring_Analog_Sound_DVI_to_HDMI to try
> force the card to not send a null digital audio signal but the Vizio still
> won't use the analog input. Is there anything else I should be looking at to
> get the analog input to work?
>
> john

The obvious response is to get the jumper and jump the digital audio from
the MB to the Video card. I would guess this would be easier than working
around it and you would get better sound, although probably not better to
the point you could tell ;)

Allen

finlay at moeraki

Nov 9, 2009, 12:41 PM

Post #3 of 4 (1238 views)
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Re: HDMI and analog audio and Vizio [In reply to]

Allen Edwards wrote:
>
>
> On Mon, Nov 9, 2009 at 7:39 AM, John Finlay <finlay [at] moeraki
> <mailto:finlay [at] moeraki>> wrote:
>
> I have a Vizio DFP TV that I conect to my mythtv system using HDMI
> (adapter) from a Nvidia 8600GT using DVI. I think that card has
> the capability to convey digital audio but I'm not using that.
> Instead I am using analog audio out to the TV. But it seems that
> the TV is not using the analog input and (I speculate) expecting
> digital audio via the HDMI. There is no setting in the TV to force
> using the analog audio input. I have tried the procedure outlined
> in http://www.mythtv.org/wiki/Configuring_Analog_Sound_DVI_to_HDMI
> to try force the card to not send a null digital audio signal but
> the Vizio still won't use the analog input. Is there anything else
> I should be looking at to get the analog input to work?
>
> john
>
>
> The obvious response is to get the jumper and jump the digital audio
> from the MB to the Video card. I would guess this would be easier
> than working around it and you would get better sound, although
> probably not better to the point you could tell ;)
>
Unfortunately the MB doesn't support SPDIF I/O so no jumper.

John
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finlay at moeraki

Nov 9, 2009, 1:57 PM

Post #4 of 4 (1233 views)
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Re: HDMI and analog audio and Vizio [SOLVED] [In reply to]

John Finlay wrote:
> Allen Edwards wrote:
>>
>>
>> On Mon, Nov 9, 2009 at 7:39 AM, John Finlay <finlay [at] moeraki
>> <mailto:finlay [at] moeraki>> wrote:
>>
>> I have a Vizio DFP TV that I conect to my mythtv system using HDMI
>> (adapter) from a Nvidia 8600GT using DVI. I think that card has
>> the capability to convey digital audio but I'm not using that.
>> Instead I am using analog audio out to the TV. But it seems that
>> the TV is not using the analog input and (I speculate) expecting
>> digital audio via the HDMI. There is no setting in the TV to force
>> using the analog audio input. I have tried the procedure outlined
>> in http://www.mythtv.org/wiki/Configuring_Analog_Sound_DVI_to_HDMI
>> to try force the card to not send a null digital audio signal but
>> the Vizio still won't use the analog input. Is there anything else
>> I should be looking at to get the analog input to work?
>>
OK I finally figured out that the custom edid option works but because I
was feeding the vizio from both the rbg and dvi ports on the card using
separate x displays I had 2 Device sections in the xorg.conf file. My
mistake was not adding the CustomEDID option to both of the Device
sections. Once I did so hdmi audio was disabled and analog audio worked.
In addition what appeared to be overscan in the DFP also was cleared up.

John
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