Public bug reported:
I have no idea what changed, but up until today (22nd June) I was
happily pushing all my sound through SPDIF into my amp, whether the
source was an AC/3 movie soundtrack, an mp3, gstreamer-properties' sound
test or anything else.
Then today, suddenly (at boot) and for no apparent reason (no new
software except updates, no config changes), only AC/3 source material
over AC/3 passthrough (e.g. in Totem) was coming through to the SPDIF
input on my amp. Mystifyingly, the same thing happened after a month or
two with Breezy.
When testing with the Dapper final Desktop CD I couldn't reproduce this
bug, even after forcing it to grab all available updates to the live-cd
packages.
I did, however, manage to track the problem down to the fact that iecset
was showing "Data: audio" for the live-cd and "Data: non-audio" for my
everyday installation, and running iecset audio true fixes the problem
temporarily. Unfortunately, a rmmod and modprobe of my sound card's
module (snd-via82xx) results in the Data status bit being reset to
false, and so no analogue audio again. :(
** Affects: alsa-lib (Ubuntu)
Importance: Untriaged
Status: Unconfirmed
--
IEC958 audio status bit is set to false for Via 8235
https://launchpad.net/bugs/50736
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