Can’t get 7.1 from Pulseaudio 4.0, which is the latest version to work with Mint. 6.0 and 7.0 support 7.1, but last I checked they haven’t been backported to Mint/Ubuntu 14.4 yet. Once I can get 7.1 DTS-HD audio out of Mint I’m dropping Windows like the turd that it is. Any help would be greatly appreciated.
Are you trying to get 7.1 sound through your HDMI cable?