I have the same board P5N7A-VM, with everything that has been posted here i have sound through HDMI including mp3's and menus.
Just so its clear, following the guide on page 1 of this thread.
Using this in /home/xbmc/.asoundrc:
Code:
pcm.dmixer {
type dmix
ipc_key 1024
ipc_key_add_uid false
ipc_perm 0660
slave {
pcm "hw:0,3"
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"
}Audio settings:
digital
off
off
default
default
Thank-you everyone!!!
EDIT: Incase it matters for someone else, i had to unmute the 'IEC958 1' in alsamixer.

I am having other issues with some other DVD played locally too -> 
Search
Help