[mythtv-users] Using HDMI Disables All Audio?

[Jim Stichnoth]

On Thu, Nov 4, 2010 at 12:49 PM, nospam312 <nospam312 at gmail.com> wrote:
> When I connect my PC to TV via a HDMI cable the sound/audio no longer
> works - I am assuming the TV expects the audio to come down the HDMI
> cable or my PC disables the standard 3.5mm sound output jacks.
>
> I am using NVIDIA driver 256.53 and ALSA 1.0.21.
>
> I have tried setting the Audio Output Driver to ALSA:HDMI and
> ALSA:SPDIF in MythTV and this does not help.  Audio Output is left as
> Stereo as my TV only supports Stereo.
>
> I have checked my alsamixer and nothing is muted.
>
> Does anyone have any pointers on what I should try to get things working?
>
> I am using 0.23fixes on Mythbuntu.

On the off chance that this helps, I had an Xorg.conf option that was
effectively disabling audio over HDMI.
http://www.gossamer-threads.com/lists/mythtv/users/391948#391948

Also, be sure to check out Allen's digital audio how-to.
http://www.mythtv.org/wiki?title=AllensDigitalAudioHowto

Jim