Comment 4 for bug 441746

I am no longer having an issue with IEC958 output in Karmic Koala. I just have to go to the Pulseaudio settings and select digital output, and it starts outputting digital sound via my optical out jack.

@Fuss: I am not seeing any HDMI audio option in Pulseaudio, or in alsamixer, so I'm not sure what's up with that. I have a Nvidia video card and the closed Nvidia driver installed and there is no setting for HDMI audio that I can see.