Disable Nvidia HDMI sound under Linux

Sound under linux and KDE seems to able to get itself confused with its settings easily enough so their is no point adding to the confusion. I’m sure that HDMI is hugely useful to those that want it and use it but up to now I never have.
Among the issues I’ve noticed is that at seemingly random times the KDE mixer Kmix will revert to setting the Nvidia HDMI output as the master channel. Then I have to change it back which starts to get old fairly rapidly. Continue reading