[mythtv-users] Asus M3N78-VM SPDIF

[Allen Edwards]

On Tue, Mar 24, 2009 at 6:36 AM, Phil Wild <philwild at gmail.com> wrote:
>
> >
> > this is OT ... can you switch between HDMI-audio and S/PDIF (IEC958)
> > in alsamixer?
> >
>
> I have the Asus M3N78-EM which is very similar to the mobo mentioned
> above and have been able to switch between the two audio outputs using
> alsa by simply changing the entries in /etc/asound.conf.
>
> I needed to add the following entry at the end of the file
> /etc/modprobe.d/alsa-base
>
> options snd-hda-intel model=6stack-dig
>
> Without it, I could not get the port to light...
>
> my /etc/asound.conf is below and I can switch between audio ports by
> changing the entry "hw:0,1" to "hw:0,3"
>
> ---start file----
> pcm.dmixer {
>   type dmix
>   ipc_key 1024
>   ipc_key_add_uid false
>   ipc_perm 0660
>   slave {
>      pcm "hw:0,1"
>      rate 48000
>      channels 2
>      format S32_LE
>      period_time 0
>      period_size 1024
>      buffer_time 0
>      buffer_size 4096
>   }
> }
>
> pcm.!default {
>   type plug
>   slave.pcm "dmixer"
> }
> ---end file----
>
> Cheers
>
> Phil
> _

Hi Phil,
I am trying to understand digital sound as much as I can and wonder if
I could ask you to try some things.  If I have already asked you
please forgive me as I deal with digital sound with so many people.
Can you try this asound.conf file?

  pcm.!default {
     type plug
     slave {
        pcm "hw:0,3"
        format S32_LE
     }
}

Another one I have been wanting someone to try is this:

  pcm.!default {
     type plug
     slave.pcm "hdmi"
  }

If the later one works, I would suggest using it.  Finally, where did
you get the asound.conf file you are using?

I will update my wiki,
http://www.mythtv.org/wiki?title=AllensDigitalAudioHowto, with the
results of your efforts.  This wiki is being widely quoted lately and
has helped a lot of people.  It isn't perfect yet and I will shortly
update it with the information Doug just gave and want to thank him
for revisiting this post.

Allen