Re: [Alsa-user] ASUS M3N78-EM Motherboard (NVidia + ALC1200) - HDMI Audio not working

[Scott B. <sco...@gm...>]

Hello Paolo, thanks for the advice.  I have done everything that you
suggested (see that ubuntu forums link, it shows my results there already).
My device does show up in aplay -l as well as aplay -L.  I am just trying to
test the sound with "speaker-test -c2 -twav -Dplughw:0,3" which should go to
the hdmi (per aplay -l).  I've enabled all of the volumes and un-muted the
digital audio in alsamixer.

I am using the latest NVidia driver (180).

The one point of yours I have not adequately tested is the EDID.  I'm not
sure, but my TV may not send the correct EDID information to the computer.
It is a 1366x768 screen and it took me a long time to get the resolution
setup correctly.  When using HDMI, it would not be displayed correctly, then
when using VGA it would be.  I used the NVidia tool to save the EDID file
when I had the VGA plugged in since it worked well with it.  Then I load
that EDID file in the xorg.conf file via adding an option to devices,
"options "CustomEDID" "DFP-0:/path/to/edid.bin"  Then I changed back to the
HDMI plug, rebooted, and my resolution is perfect with HDMI.  NOTE HOWEVER,
that I've tried the audio both with and without using this customEDID
option.  When it is not used, the resolution is not quite correct and the
audio still does not work.

If my EDID information from the TV is wrong, what can I do to make the audio
work?

Thanks,

Scott



> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 12 May 2009 11:42:41 +0200
> From: Paolo Saggese <pms...@ya...>
> Subject: Re: [Alsa-user] ASUS M3N78-EM Motherboard (NVidia + ALC1200)
>        - HDMI  Audio not working
> To: als...@li...
> Message-ID: <200...@ya...>
> Content-Type: text/plain;  charset="utf-8"
>
> On Tuesday 12 May 2009, Scott Barlow wrote:
>
> > I cannot get the HDMI audio to work with my ASUS M3N78-EM motherboard!
>  I've
>
> To get audio over HDMI may be not so straightforward at times, 'cause
> it depends on a number of different things... not necessarily related
> to the audio system (ALSA).
>
> First of all: do you see the output device listed with aplay -l ?
>
> Consider that the device which sends audio through HDMI is likely NOT
> the default one (which usually is analog out), but rather is seen as a
> digital out (that is, IEC958 aka S/PDIF).
>
> If the device exists and is listed, you'll have to explicitly setup
> your apps to use it (e.g. plughw:0,1 or whatever it is) or define it
> as default on your "~/.asoundrc" file.
>
> Which video driver are you using? AFAIK having audio over HDMI enabled
> depends also on the nVidia video driver (you must use a recent version
> of the nVidia proprietary driver).
>
> It does also depend on the EDID of your A/V screen (HDTV, projector?)
> properly reporting audio capability in the extensions block, otherwise
> the nVidia (VIDEO) driver will NOT enable audio over HDMI.
>
>
> Ciao,
>                                Paolo.
>
> --
> Skype: Paolo.Saggese
> http://borex.lngs.infn.it/saggese
> You can still escape from the GATES of hell: Use Linux!
>