Sorry I got the same problem. I have to set my OS X as iMacPro1,1 then it can work.
Anyway I would like to know that how to set IGPU correctly. I also used as same as CPU as you. (I9 9900K)
Please help. Thank you in advance.
I also have the same system i7 3770k and GT 640 3,1 definition but AirPlay didn't full support (no mirroring). Do you get full support if set to 8,1 definition? Thank.
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