Only thing you need to do is to set the HDMI and internal cards profiles to disabled.
On KDE: 1 KDE system setting app 2. Multimedia configuration panel 3. Phonen sub menu 4. 2nd tab (Sound HW) in the phonon settings screen 5. (Sound) card: [for both internal and NVIDIA HDMI] 6. Profile: Disabled/off or what ever it is in your locale or in english... on other DE/WMs 1. install pavucontrol 2. open pavucontrol 3. follow the KDE stuff from step 4
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