that's a workaround the issue seems to be a pulseaudio one.
** Changed in: pulseaudio (Ubuntu)
Sourcepackagename: gnome-control-center = pulseaudio
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[intrepid alpha1] sound regression / no media playback on MacBook (second gen)
https://bugs.launchpad.net/bugs/244937
You received this bug
I would guess this should be assigned to 'gnome-sound-properties', as
changing settings there seems to have fixed the issue. As per Niels
comment above, changing the mixer settings to ALSA caused the sound to
work properly again.
** Changed in: gnome-control-center (Ubuntu)
Sourcepackagename:
