Sapphire RX580 freezes with com.apple.DumpGPURestart

[vinnymac]

I have the same exact issue. Latest Lilu/Weg and same error logs with the RX 580. Latest ASUS BIOS and disabling multi-core doesn't do anything to fix it. I have been trying to find a solution for 6 months now, and the system works just fine in Windows/Ubuntu. The freeze is unreliable too, can happen within 15 minutes of booting macOS 10.14 or after a week.

EDIT: I am now running iMac19,1 SMBIOS with the memory profile set to auto instead of XMP I, and that has been working great for the passed 40 hours. I am pretty sure this is the fix.

 

[JohnWeise]

Install Lilu + WhatEvergreen kexts in your EFI folder and enable iGPU in the BIOS.
I had the same problem some time ago, it's related to hardware acceleration.

worked for me