Re: Overscan and HDMI audio questions
The uninstall method is get into your console with X and Gnome killed and type
If you want 5.1 audio I cannot help, I just use my TV speakers. I believe that requires a patch as the current Linux kernel has a regression, breaking multi-channel audio. Maybe take a look at the ol' Nvidia HDMI audio guide or get some more help.
Just make sure if you do get it working, take the time on the forums to help others get it to work as well. Happy trails!