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HDCP Amazon prime - 720p vs 1080p

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I have problems with Amazon Prime on my system under HighSierra 10.13.
AmazonPrime videos are played in HighSierra with 720p, in Windows 10 with 1080p.
Graphics card is a Vega 56 (flashed to 64), monitor (1440p) connected via DP, Shiki.kext is installed (but makes no sense), CPU is an Intel i9 7900X.
Movies/trailers with DRM can be played without problems.
 
Someone have some tips for me to solve my problem?
 
PS:
In Photoshop I have to deactivate the checkbox "Use native operating system GPU acceleration", otherwise the program crashes after a few clicks. But I've activated GPU acceleration and it works, but not the "native" GPU acceleration.
Maybe there is still a problem with the graphics card. (running now native, OOB)

 

post-9144-0-15513000-1509317110_thumb.jpg

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