[mythtv-users] [OT]HDMI, SPDIF, DVI Nvidia, etc

Calvin Harrigan charriglists at bellsouth.net
Thu Feb 19 21:04:17 UTC 2009


Allen Edwards wrote:
> 
> 
> On Thu, Feb 19, 2009 at 12:32 PM, Calvin Harrigan 
> <charriglists at bellsouth.net <mailto:charriglists at bellsouth.net>> wrote:
> 
>     OK, disaster might be a bit strong.
> 
>     I've been looking for good information on disabling the audio
>     portion of the video card output for almost a week.  My problem is
>     with my new video card, when I connect it to the tv it sees that it
>     is hdmi auddio capable and enables audio over the dvi->hdmi cable.
>      Doing so caused the tv to ignore the stereo analog signal that it's
>     being fed and try to play the hdmi audio which is most times just
>     crackling noises.  If I connect my spdif output to a little
>     connector on the video card I can get audio for several applications
>     (mythtv being one), but not all, worst than that after the audio
>     stops the crackling noises begin again, especially after using xine.
>      I would really like to disable that hdmi audio feature, but what
>     I've found on the nvidia forums is not working.
>            I'm running Linux kernel 2.6.24 with Nvidia drivers 180.29
>     drivers with a 9500GT (G96). Nvidia is rightfully claiming that the
>     TV is telling the driver via it's edid (Extension Block Details
>     really) that the tv has audio capabilities via hdmi. With that
>     information I downloaded my TVs edid and edited it to remove all
>     references to having audio and redid the checksums etc. X thinks the
>     edid is fine, so does monitor asset manager, but for some reasons it
>     seems that the driver still enables audio. The only way I can
>     disable audio for sure is to remove the entire Extension Block, but
>     doing so removes several of the extended supported modes that I use.
>     Seems that the driver is only looking for the presence of an
>     extension block and is not really reading into it to discern whether
>     or not the set supports audio. I can send both edids the original
>     and the patched versions if anyone would like to take a look.
>            Anyone have similar issues/problems?  Any input would be
>     greatly appreciated, thanks.
> 
>     Calvin
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> 
> 
> 
> I will just point out that I had a problem where some applications would 
> work with spdif and some would not and I had to connect an analog cable 
> for sound from those applications. After putting the wiki together and 
> following it, I now have all applications putting out sound through the 
> spdif putput and have disconnected the analog cable.  The wiki has three 
> setups for hdmi audio and I must admit to not knowing which ones work 
> the best or at all but I think they all should work.  If you have not 
> already done so, you might give them a try.
> http://www.mythtv.org/wiki?title=AllensDigitalAudioHowto
> 
> Please let me know what your experience is with the three setups if you 
> try them so I can refine the wiki for the next person.
> 
> Allen
> 
> 
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Thanks,
I probably could have gotten the other apps to work but didn't try to 
because of the noise that I get when notihing is playing.  It's quite a 
grating noise.

Calvin




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