This is probably a case of the outputs being muted, check using alsamixer.
Here is a quick overview of what to look for with the beagle c4 -> http://linuxsound.wordpress.com/2010/12/31/sound-beagleboard-c4/
This is probably a case of the outputs being muted, check using alsamixer.
Here is a quick overview of what to look for with the beagle c4 -> http:// linuxsound. wordpress. com/2010/ 12/31/sound- beagleboard- c4/