Public bug reported:
Binary package hint: pulseaudio
ALSA by default in Ubuntu 9.10 duplicates front speakers output to the
rear speakers when in stereo mode (so one can attach headphones to the
rear output and switch between speakers and headphones easily or use
less noisy rear output on
Have you tried switching the audio profile in the volume control appet
to 4.0 output? When doing so, does this send stereo audio to all
speakers?
Thanks.
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PulseAudio doesn't duplicate front speakers to rear in stereo mode
https://bugs.launchpad.net/bugs/505428
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