New Patch is HERE (August 30th!!) Feedback needed for final release.

[Fredagsmys]

I found this thread: http://ubuntuforums.org/showthread.php?t=1126958 in ubuntu forum. It seems to explain why I have choppy sound when playing penumbra.

Ubuntu simply have a crapy version of a crapy pulseaudio in its jaunty release and it should be solved by upgrading pulseaudio. I haven't tried it myself yet and I'm not sure if I will either because soon a new version of ubuntu will be released. So instead of doing anything, I think I joust sit on my arse and wait for it.