I'm having the same issue. I came across the following:
"PulseAudio is now enabled by default.
Some non-GNOME applications still need to be changed to output to pulse/esd by default and the volume control tools are not yet integrated." (
wiki.ubuntu.com)
I'm not really sure what that means though.
Edit: ^R-Alien was kind enough to walk me through how sound works in linux. Apparently my problem involved Amarok, a kde program I choose to run in gnome for its intelligent gui and usage of sql lite. It was attempting to use the '
artsd' wrapper so I had to
close amarok, pull up my terminal,
kill artsd,
open amarok back up and
change the audio wrapper
to '
ALSA'.
I also changed my settings in
system > preferences > sound . On the '
devices tab', I changed everything to use '
ALSA' rather than auto detect. On the '
sound tab' I
disabled 'ESD'.