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GPU Spoof

So you need to hide your unsupported GPU? Well with OpenCore things are slightly different, specifcally that we need to specify to which exact device we want to spoof. There's 3 ways we can do this:

  • Boot Flag
    • Disables all GPUs except the iGPU
  • DeviceProperties
    • Disables GPU on per-slot basis
  • SSDT
    • Disables GPU on per-slot basis

Boot Flag

By far the simplest way, all you need to do is add the following bootflag:

-wegnoegpu

Do note that this will disable all GPUs excluding the iGPU

DevicePropeties Method

Here is quite simple, find the PCI route with gfxutil and then create a new DeviceProperties section with your spoof:

/Users/(YourUsername)/Downloads/(gfxdownload folder)/gfxutil -f GFX0

And the output will result in something similar:

DevicePath = PciRoot(0x0)/Pci(0x1,0x0)/Pci(0x0,0x0)/Pci(0x0,0x0)/Pci(0x0,0x0)

With this, navigate towards Root -> DeviceProperties -> Add and add your PCI route with the following properties:

Key Type Value
name data 23646973706C6179
IONAME string #display
class-code data FFFFFFFF

SSDT Method

There's many ways to find the path but generally the easiest way is to got into Device Manager under windows and find the PCI path.

Example of device path:

\_SB.PCI0.PEG0.PEGP

DefinitionBlock ("", "SSDT", 2, "hack", "spoof", 0)
{
    Method(_SB.PCI0.PEG0.PEGP._DSM, 4)
    {
        If (_OSI ("Darwin"))
        {
            If (!Arg2) { Return (Buffer() { 0x03 } ) }
            Return (Package()
                {
                    "name", Buffer() { "#display" },
                    "IOName", "#display",
                    "class-code", Buffer() { 0xFF, 0xFF, 0xFF, 0xFF },
                    "vendor-id", Buffer() { 0xFF, 0xFF, 0,  0 },
                    "device-id", Buffer() { 0xFF, 0xFF, 0, 0 },
            })
        }
    }
}

What this SSDT does special compared to Rehabman's SSDT is that this adds the If (_OSI ("Darwin")){} block so that this SSDT wouldn't be applied when booting other operating systems