[ubuntu] unable to get 7.1 from digital output

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http://ubuntuforums.org – Hi there I currenlty connect my PC via Optical cable to my 7.1 surround sound system, but i only get stereo sound from the connection. i have looked into the sound settings (by right clicking the audio symbol in top right corner under hardware all i'm able to get is Digital Stereo IEC958 there are analogue 5.1/7.1 options however but they seem to turn off my optical port. Regards Weesol Ps I am a complete Noob when it comes to linux, untill recently i was a windows guy, if theres a fix i will need step by step instructions please thanks (Hardware)