[Solved] E6530: dGPU is disabled in Windows after reboot from MacOS

[Soterlll]

Hi!

I'm having a problem with DGPU. It's disabled using SSDT and ACPI patching.

The issue is: After reboot from MacOS into Windows Nvidia NVS 5200m is not present in Device Manager. How to fix the problem?

 

Specs:

Dell Latitude E6530 with A22 Bios 

i7-3740QM

1366x768 screen

16GB RAM

HD 4000 + NVS 5200M(disabled in SSDT-DGPU)

Mojave 10.14.6

EFI.rar

[Hervé]

If you're using OpenCore that's normal. Only Clover or Chameleon apply ACPI patches at macOS level only by default.

[Soterlll]

I'm using Clover. I think the problem dGPU is disabled when i reboot Mac OS. I don't know how to enable it while rebooting.

 

If i use only -wegnoegpu boot arg (disabling patches and SSDT-DGPU) Nvidia card is present in Device manager.

 

Spoiler

DefinitionBlock ("", "SSDT", 2, "hack", "DGPU", 0x00000000)
{
    External (_SB_.PCI0.PEG0.VID_._OFF, MethodObj)    // 0 Arguments
    External (_SB_.PCI0.PEG0.VID_._ON_, MethodObj)    // 0 Arguments
    External (ZPTS, MethodObj)    // 1 Arguments
    External (ZWAK, MethodObj)    // 1 Arguments

    Method (EGPU, 0, NotSerialized)
    {
        If ((_OSI ("Darwin") && CondRefOf (\_SB.PCI0.PEG0.VID._ON)))
        {
            \_SB.PCI0.PEG0.VID._ON ()
        }
    }

    Method (DGPU, 0, NotSerialized)
    {
        If ((_OSI ("Darwin") && CondRefOf (\_SB.PCI0.PEG0.VID._OFF)))
        {
            \_SB.PCI0.PEG0.VID._OFF ()
        }
    }

    Device (RMD1)
    {
        Name (_HID, "RMD10000")  // _HID: Hardware ID
        Method (_INI, 0, NotSerialized)  // _INI: Initialize
        {
            If (_OSI ("Darwin"))
            {
                DGPU ()
            }
        }

        Method (_STA, 0, NotSerialized)  // _STA: Status
        {
            If (_OSI ("Darwin"))
            {
                Return (0x0F)
            }

            Return (Zero)
        }
    }

    Method (_PTS, 1, NotSerialized)  // _PTS: Prepare To Sleep
    {
        If (_OSI ("Darwin"))
        {
            EGPU ()
        }

        ZPTS (Arg0)
    }

    Method (_WAK, 1, Serialized)  // _WAK: Wake
    {
        Local0 = ZWAK (Arg0)
        If (_OSI ("Darwin"))
        {
            DGPU ()
        }

        Return (Local0)
    }
}

 

 

[Hervé]

Ok, so dGPU remains disabled on warm reboots from macOS into Windows. There are only a few ways to address this:

1. you opt for the boor arg option rather than the patched ACPI code.
2. you call on your EGPU ACPI code on macOS shutdown to re-enable the dGPU; that should be handled by an event that you need to identify. Maybe one of those EV methods.
3. you power off your laptop when you want to boot Windows.

[Soterlll]

Thanks for your help.

I'll stick to boot arg solution.

Problem is solved.