[mythtv-users] MythTV 0.24 HDMI audio problem

[thigger]

On Wed, Nov 17, 2010 at 7:28 PM, Mr. Duncan McDonald <
duncan.john.mcdonald at gmail.com> wrote:

> I'm using Mythbuntu 10.4 with Alsa 1.0.23 (not Pulse Audio because for some
> reason I could never get this to work with 10.4) - the connection is over a
> Nvidia GT220 card using HDMI to a surround sound receiver.
>
> The problem is that when I first boot the machine I don't get audio out of
> MythTV until I run something like Mplayer
>

I'm using Ubuntu 10.04 (well, a hybrid with packages that probably go back
several Ubuntu versions) and recently bought a GT220 to allow me to watch HD
without burning the processor. I'm running sound over HDMI direct to the TV
(an LG 37LC2D I think).

The sound took a while to get set up properly - but in the end I found that
using "ALSA:plughw:1,7" as my audio output seemed to be the best. (It's card
1 because the onboard audio takes position 0). I've also had it working with
ALSA:plughw:1,3 but that seems to be less reliable.

(you can get the IDs for your card by typing 'aplay -l' at a bash prompt)

When I was fiddling around previously I found, like you, that it seemed to
work best if a sound had been played previously from something else. I'm not
sure that's true any more (I was trying to get plughw:1,3 working
previously) but I've left the following command in /etc/rc.local:

aplay -D plughw:1,7 /home/thigger/scream4.wav
#wilhelm scream

The machine only gets rebooted every few months anyway, but it did upset the
wife when I rebooted with the TV on :)

Let me know if that works for you or you want more info; I think I've read
almost everything on the internet on this topic getting it all working!

Also, is there any chance you can let me know what 'dmesg' says for you in
your HDMI section?
Mine:
[18161.599219] HDMI: detected monitor 37LC2D-EC
[18161.599224]    at connection type HDMI
[18161.599230] HDMI: available speakers: FL/FR
[18161.599239] HDMI: supports coding type LPCM: channels = 2, rates = 44100
48000 88200, bits = 16

I'm mostly interested as I thought my TV (with SRS TruSurround XT) was
supposed to pretend it had 5.1 and supported dolby/dts whereas my nvidia
drivers (version 195) - just want to see if this is a problem with the TV or
whether the GT220/nvidia drivers/ALSA are reading it wrong.


tom
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mythtv.org/pipermail/mythtv-users/attachments/20101117/eaff5069/attachment.htm>