sam298 Posted December 12, 2020 Share Posted December 12, 2020 (edited) I am using SSDT-PLUG, SSDT-EC, SSDT-SBUS-MCHC and SSDT-PMC - using Opencore 0.64 with iMac19,1 smbios for my B360 Aorus with i7-9700k. USB mapping kext included in boot. Sapphire Pulse RX 580 (2 4k monitors using 2 DP ports) & UHD 630 headless mode Sleep works fine. But after wake up, keyboard and desktop powers on but black screen on my 4k monitors (Dell and LG) Per the link below, I have to disable AGDC in my dGPU https://dortania.github.io/OpenCore-Post-Install/universal/sleep.html#fixing-gpus If I use dgpu device properties with CFG,CFG_USE_AGDC, it boots and won't get to login screen - screen goes black. If I use only CFG_USE_AGDC, it boots normal but when I type IOReg -lw0 | grep "CFG_USE_AGDC" I still get output "CFG_USE_AGDC" = Yes Opencore suggests using SSDT to disable and I tried adding SSDT along with WEG and still unable to disable AGDC in dGPU. WEG introduced igfxagdc=0 boot arg to disable but I believe this is for IGPU which I am not using. I tried it anyway but didn't work. Or use device property disable-agdc but no details on how to add - will it be boolean no? I have disabled RC6 Render Standby in Bios. Sleep works with windows installed in another nvme drive, so I hope my bios settings are correct. Anyone with 4k monitors connected to display ports who fixed wake from sleep? Please help. DefinitionBlock ("", "SSDT", 2, "APPLE ", "SSDTAMDG", 0x00001000) { External (_SB_.PCI0.PEG0.PEGP, DeviceObj) // (from opcode) Scope (\_SB.PCI0.PEG0) { Device (PEGP) { Method (_DSM, 4, NotSerialized) // _DSM: Device-Specific Method { If (LEqual (Arg2, Zero)) { Return (Buffer (One) { 0x03 }) } Return (Package (0x1C) { "CFG_USE_AGDC", Buffer (One) { 0x00 }, Edited December 12, 2020 by sam298 Link to comment Share on other sites More sharing options...
sam298 Posted December 14, 2020 Author Share Posted December 14, 2020 (edited) I disabled xmp profile in bios and sleep is working good now. Didn't need any SSDT or boot args. Edited December 16, 2020 by sam298 1 Link to comment Share on other sites More sharing options...
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