External Soundcard fully working with Ubuntu
I found this also - optical out was lit up until connected to PC - strange, eh? The fix to this: open alsamixer in a terminal. If you see only a single channel, press F6, select 'Sound Blaster Extigy', press enter, you should then see a load of channels. Press right arrow until you get to 'S/PDIF Optical'. Press 'm' to unmute it. Optical out will light up. Job done!
Originally Posted by gtippitt