Vega 56 related freeze when system is left idle

My hackintosh is working great, except for one thing. Whenever I leave the system idle on the desktop, with the displays on and no apps open, the entire system freezes. The fans on the GPU then take off at 100%.

When it happens, I can see a lot of the following messages in the console:

Jan 9 12:59:11 Water-van-Robbert com.apple.xpc.launchd[1] (com.apple.DumpGPURestart): Service only ran for 0 seconds. Pushing respawn out by 10 seconds. Jan 9 12:59:41 --- last message repeated 2 times --- Jan 9 12:59:41 Water-van-Robbert com.apple.xpc.launchd[1] (com.apple.DumpGPURestart): Service only ran for 0 seconds. Pushing respawn out by 10 seconds. Jan 9 13:00:11 --- last message repeated 2 times --- 

I searched online and here on reddit, but did not find any working solution. Does anyone here have any idea what could be the cause of this problem and how it could be fixed?

Things that are working fine:

  • Normal usage
  • Sleep
  • GPU acceleration with multi-monitor
  • APFS with FileVault
  • Audio
  • Network (except wifi)

Specs: Asus MAXIMUS X HERO WIFI, i7 8700K, Gigabyte Radeon RX VEGA 56 GAMING OC 8G, Samsung 970 EVO

Installed kexts:

AppleALC.kext AtherosE2200Ethernet.kext CodecCommander.kext FakeSMC.kext IntelMausiEthernet.kext Lilu.kext RadeonVega56AirCoolingFansFix.kext RealtekRTL8111.kext SmallTreeIntel82576.kext USBInjectAll.kext WhateverGreen.kext XHCI-200-series-injector.kext XHCI-300-series-injector.kext XHCI-x99-injector.kext 
submitted by /u/Obbut
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