Strange glitches on RX580 with IGPU quick sync enabled

[Blindedbythelights]

I get strange glitching sometimes when playing videos via VLC/QT or via Quicklook (QT?). However, I can play the exact same video that was glitching via VLC in audio software called Reaper via it's video player and there's no glitching. You can set the video decoder in reaper to be either VLC/QT or FFMPEG. It's currently set to VLC. So why would it glitch via the VLC app in Mojave but not when being played in some audio software using the decoder? Does this give any clues? I thought it was an IGPU issue but I've had a forum mod check over my EFI & config and everything seems correct.


Mojave 10.14.5
SMBIOS 19,1
MSI Z370PC PRO
8700KCPU
Asus ROG RX580
IGPU setup with headless 8700K ig platform via Hackintool patch
Latest Clover
I am about 3 BIOS versions behind, is this worth updating? I doubt this issue is due to that?

I think trying iMacPro 1,1 SMBIOS might help with IGPU off, any ideas?

 

[Blindedbythelights]

With igpu off in bios and iMac Pro 1,1 SMBIOS the glitching seems to be fixed! Might be speaking too soon but seems to be good so far. I'm also seeing full hardware acceleration via the RX580.