I can also confirm this bug in Hardy Heron. FWIW, it's also an issue
in Mandriva 2008, so it's an ALSA bug not specific to Ubuntu.
It seems to be a real show-stopper with the intel8x0 driver; I have
another box with a newer Asus mobo (uses the hda_intel driver) also
running Myth, which I was finally able to get SPDIF working with
(granted, with a a different "cheat" in .asoundrc).
Unfortunately, neither the .asoundrc above or the one from my other
machine worked on this box (Abit AN8-32X) - at least when using the
defaults in MythTV and Amarok. I haven't yet had the time to try these
yet with all of the other options ("ALSA:plug:hw0,2", etc.).
This definitely occurs when switching from a PCM source to a Dolby
Digital 5.1 source; if I try to play another PCM source, I can't unless
I open up a terminal and issue this:
iecset audio 1
and the sound returns. Even if I then do:
iecset audio 0
it will still work....for a while. I often lose the sound completely,
however - be it 2/3 of the way through a movie or after one or two songs
- requiring the above command(s) from a terminal. This is a royal pain.
I even got to the point of writing a little script to do this and ran it
as a cron job every minute - but that was not acceptable either, because
if it runs while sound is playing, I get a 1-2 second silent "gap".
This bug was reported two and a half years ago...'bout time it was squashed,
don't you think?!?!?!
--
SPDIF won't play PCM after playing AC3
https://bugs.launchpad.net/bugs/25632
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