Gigabyte GA-MA78GM
ALC883 Digital (enable SPDIF)
amixer set IEC958 100 unmute
Open alsa-mixer, menu > preferences. Select the checkbox for IEC958. A new tab should appear in the alsa-mixer main window. In the tab, there is another checkbox for IEC958. Select this one, and the digital channel should now be unmuted.
http://www.mythtv.org/wiki/Intel_HD_Audio_-_Realtek_ALC88x
Graphic
http://wiki.cchtml.com/index.php/Ubuntu_Intrepid_Installation_Guide
https://bugs.launchpad.net/ubuntu/+source/fglrx-installer/+bug/284119