MP 1,1-5,1 Pink Screen on Wake in Catalina on Mac Pro 5,1 with RX 5700XT

[calmacfan]

Any ideas on why I'm getting a pink screen on wake on my 2012 Mac Pro running Catalina via a RX 5700XT? I have it connected via HDMI to a Dell Ultrasharp U2415 LED Monitor. It will boot just fine, but It'll randomly have a pinkish hue on wake, once the screen is refreshed via password entry it's just fine. Super Weird. I've tried disconnecting the HDMI cable and reseating my video card with no resolution. When booted to Windows 10 there's no pink screen issue so I assume it's more OSX/software related not hardware. Any ideas appreciated.

 

[riggieri]

It’s the screen seeing YUV signal vs RGB signal. Could be cable as well.
I have the same problem.

 

[calmacfan]

I'm using a 16' long, High Speed HDMI with Ethernet, Mac specific cable from PNY. It's rated for 10.2 GB. Are you using a similar cable? Wondering if it's an issue with that specific cable? I saw a post that discussed forcing RGB via a KEXT but I don't want to go that route if it's something simple. Maybe I'll get another cable and see if that makes a difference. Are you running Catalina as well? I didn't see this while running Mojave with my old RX-580XT video card either.