[mythtv-users] HDMI audio: plughw:0, 7 works but hdmi:CARD=NVidia doesn't

Thu Mar 17 11:52:23 UTC 2011

Dave Badia wrote:

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I finally conceded that my GT220 must be one of the ones that doesn’t
work and bought a GT430 instead.

The GT430 works great using hdmi:CARD=NVidia,DEV=3 and I’m able to
stream the advanced codecs to my receiver.  I updated the wiki with my
experiences.

Dave
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I have sruggeled a bit on getting HDMI audio to work properly on two GT430 in two frontends.

I am using Alsa 1.0.23 and aplay -l reported four HDMI sound devices, 3,7,8 and 9.

In KDE/Phonon if I tested with HDMI only I got no sound. Using either of HDMI 3,7,8 or 9 worked with PCM sound.

In MythTV (0.24-fixes git version as of yesterday) the scan for devices only returned hdmi:CARD=Nvidia and no index 3,7,8 or 9. Selecting this device PCM sound worked, but DD sound from a recording only produced white noise.

I then remembered that when setting up the first card I read about setting a probe_mask for modprobe, but thought that I hadn't actually used that. After starting the working frontend I found that I indeed had used a probe_mask so that only one of the HDMI devices was visible.
Adding this to the second frontend got everything working with hdmi:CARD=Nvidia.

Stephen Warren of Nvidia has written a very descriptive document about HDMI audio.
This document was where I found the solution.
http://www.nvnews.net/vbulletin/showthread.php?t=159346

Jens