Lubuntu doesn't use pulse audio, only ALSA. The only tools that come with it are alsamixer, alsactl, and aplay. I have already managed to output sound from my TV using this command: aplay -D ...
After recently installing ubuntu 12.04 Desktop Edition lts on my nvida optimus equipped laptop (ASUS N53J) I tried to get hdmi out to work by using the method described in this guide here. I am able ...