If you can manage to do it in a Live installation, try installing the package pavucontrol and select the HDMI output in that.
- Code: Select all
equo install pavucontrol
For example, in PA Volume Control on the Configuration tab I select Profile: On for my Redwood HDMI Audio (Radeon HD 5000 series) and Profile: Off for my Built-in Audio. But it depends what drivers have been loaded from the LiveDVD in your case, which may or may not be compatible with your HDMI hardware. I.e., it might not be something you can do with a LiveDVD, only with an installation to the HDD and the appropriate drivers installed. Anyway, have a play with pavucontrol and see.