FaceTime: No incoming video problem solution

I’ve seen this in various places without a fix. Here‘s what finally worked for me.

My Hack: Skylake 6700K with AMD RX 570 on macOS Ventura 13.6:

-radcodec unfairgva=1 igfxmetal=1 gfxrst=1 -igfxsklaskbl igfxfcms=1 igfxonln=1 

As far as I understand:

-radcodec enables my RX570

The rest of the arguments enable Skylake iGPU

And

Unfairgva=1 allows me to watch AppleTV with:

defaults write com.apple.AppleGVA gvaForceAMDKE -boolean true 

But this disables FaceTime decoding, to make FaceTime usable again:

defaults write com.apple.AppleGVA gvaForceAMDKE -boolean false 

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