Thanks for your reply madbiologist.
Yes, I think you are correct.
I've been checking all the audio channels and in fact I do expect a 5.1 upmix,
whereas I get a 5.0 upmix (from a stereo audio file)(Note this is an erratum in
my first post).
But when checking other applications indeed the upmix
After further research I can confirm that this behaviour is caused by a
bug in Pulseaudio
checking with:
pulseaudio --dump-conf
it was clear that speakers where not recognised correctly from alsa layer (alsa
worked fine, as was clear from several speaker tests (speaker-test
-Dplug:surround51
continued in
https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/675833
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Totem uses Stereo sound while set at 5.1
https://bugs.launchpad.net/bugs/674730
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MP3, happens with all mp3's i've checked so far.
** Attachment added: 003 All I need.mp3
https://bugs.launchpad.net/ubuntu/+source/totem/+bug/674730/+attachment/1733036/+files/003%20All%20I%20need.mp3
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Totem uses Stereo sound while set at 5.1
https://bugs.launchpad.net/bugs/674730
You
Public bug reported:
Binary package hint: totem
When playing a song in totem, the audio starts in Stereo mode even when the
menu item says it's in 5.1 mode. The sound settings are configured correctly
for the rest of the system.
This can be 'solved' by setting the totem audio mode to Stereo
