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[Success] AMD RX6000 Series working in macOS

Hey folks.

I just got a XFX Speedster MERC 319 Radeon RX 6900 XT Limited Black. It's a XTXH card and I try to inject a proper Device-ID. Without success.

Clean path without SSDT:

Bildschirmfoto 2022-01-26 um 12.54.23.png


That's the one with my (non working) SSDT (display is reneamed to GFX0):
Bildschirmfoto 2022-01-25 um 10.22.19.png


That's the ACPI tree on ASUS X299 Sage10G. And this is the content of my custom SSDT:
Code:
/*
 * Intel ACPI Component Architecture
 * AML/ASL+ Disassembler version 20200925 (64-bit version)
 * Copyright (c) 2000 - 2020 Intel Corporation
 *
 * Disassembling to symbolic ASL+ operators
 *
 * Disassembly of iASLxtp8Gc.aml, Wed Jan 26 08:58:03 2022
 *
 * Original Table Header:
 *     Signature        "SSDT"
 *     Length           0x0000006C (108)
 *     Revision         0x02
 *     Checksum         0x3A
 *     OEM ID           "ACDT"
 *     OEM Table ID     "BRG0"
 *     OEM Revision     0x00000000 (0)
 *     Compiler ID      "INTL"
 *     Compiler Version 0x20200925 (538970405)
 */
DefinitionBlock ("", "SSDT", 2, "ACDT", "BRG0", 0x00000000)
{
    External (_SB_.PC02.BR2A.SL05, DeviceObj)

    Scope (\_SB.PC02.BR2A.SL05)
    {
        Device (BRG0)
        {
            Name (_ADR, Zero)  // _ADR: Address
            Device (GFX0)
            {
                Name (_ADR, Zero)  // _ADR: Address
            }
        }
    }
}
I guess there is something wrong with my path?

These are the prperties I try to inject:
Bildschirmfoto 2022-01-26 um 09.06.10.png


And the SSDT-BRG0-6900XT.aml is activated:
Bildschirmfoto 2022-01-26 um 09.08.36.png


Anything else missing? Flashing the vBIOS is no option, the GPU is not mine.

All Kexts are uptodate:
Bildschirmfoto 2022-01-26 um 09.16.54.png


I'm runnig MacOS 12.1. There is a graphic output, but without Metal support/hardware accelleration and everything is very laggi. Any ideas?
 

Attachments

  • Bildschirmfoto 2022-01-26 um 12.21.15.png
    Bildschirmfoto 2022-01-26 um 12.21.15.png
    135.5 KB · Views: 51
Last edited:
Hey folks.

I just got a XFX Speedster MERC 319 Radeon RX 6900 XT Limited Black. It's a XTXH card and I try to inject a proper Device-ID. Without success.

Clean path without SSDT:

View attachment 540385

That's the one with my (non working) SSDT (display is reneamed to GFX0):
View attachment 540365

That's the ACPI tree on ASUS X299 Sage10G. And this is the content of my custom SSDT:
Code:
/*
 * Intel ACPI Component Architecture
 * AML/ASL+ Disassembler version 20200925 (64-bit version)
 * Copyright (c) 2000 - 2020 Intel Corporation
 *
 * Disassembling to symbolic ASL+ operators
 *
 * Disassembly of iASLxtp8Gc.aml, Wed Jan 26 08:58:03 2022
 *
 * Original Table Header:
 *     Signature        "SSDT"
 *     Length           0x0000006C (108)
 *     Revision         0x02
 *     Checksum         0x3A
 *     OEM ID           "ACDT"
 *     OEM Table ID     "BRG0"
 *     OEM Revision     0x00000000 (0)
 *     Compiler ID      "INTL"
 *     Compiler Version 0x20200925 (538970405)
 */
DefinitionBlock ("", "SSDT", 2, "ACDT", "BRG0", 0x00000000)
{
    External (_SB_.PC02.BR2A.SL05, DeviceObj)

    Scope (\_SB.PC02.BR2A.SL05)
    {
        Device (BRG0)
        {
            Name (_ADR, Zero)  // _ADR: Address
            Device (GFX0)
            {
                Name (_ADR, Zero)  // _ADR: Address
            }
        }
    }
}
I guess there is something wrong with my path?

These are the prperties I try to inject:
View attachment 540366

And the SSDT-BRG0-6900XT.aml is activated:
View attachment 540367

Anything else missing? Flashing the vBIOS is no option, the GPU is not mine.

All Kexts are uptodate:
View attachment 540368

I'm runnig MacOS 12.1. There is a graphic output, but without Metal support/hardware accelleration and everything is very laggi. Any ideas?


@jan2ooo - I'm not sure why, but your ACPI path has 2 extra levels and I think that is why the standard SSDT that we've been using doesn't work in your system. I don't know enough about this procedure to name those levels, and I'm not even sure the spoof would work.

There was a fellow who was trying to get the spoof to work on an eGPU box. He wasn't successful, but I seem to recall in his case that he had multiple extra levels as well. Maybe scroll back a few pages and see what he attempted.
 
Hey folks.

I just got a XFX Speedster MERC 319 Radeon RX 6900 XT Limited Black. It's a XTXH card and I try to inject a proper Device-ID. Without success.

Clean path without SSDT:

View attachment 540385

That's the one with my (non working) SSDT (display is reneamed to GFX0):
View attachment 540365

That's the ACPI tree on ASUS X299 Sage10G. And this is the content of my custom SSDT:
Code:
/*
 * Intel ACPI Component Architecture
 * AML/ASL+ Disassembler version 20200925 (64-bit version)
 * Copyright (c) 2000 - 2020 Intel Corporation
 *
 * Disassembling to symbolic ASL+ operators
 *
 * Disassembly of iASLxtp8Gc.aml, Wed Jan 26 08:58:03 2022
 *
 * Original Table Header:
 *     Signature        "SSDT"
 *     Length           0x0000006C (108)
 *     Revision         0x02
 *     Checksum         0x3A
 *     OEM ID           "ACDT"
 *     OEM Table ID     "BRG0"
 *     OEM Revision     0x00000000 (0)
 *     Compiler ID      "INTL"
 *     Compiler Version 0x20200925 (538970405)
 */
DefinitionBlock ("", "SSDT", 2, "ACDT", "BRG0", 0x00000000)
{
    External (_SB_.PC02.BR2A.SL05, DeviceObj)

    Scope (\_SB.PC02.BR2A.SL05)
    {
        Device (BRG0)
        {
            Name (_ADR, Zero)  // _ADR: Address
            Device (GFX0)
            {
                Name (_ADR, Zero)  // _ADR: Address
            }
        }
    }
}
I guess there is something wrong with my path?

These are the prperties I try to inject:
View attachment 540366

And the SSDT-BRG0-6900XT.aml is activated:
View attachment 540367

Anything else missing? Flashing the vBIOS is no option, the GPU is not mine.

All Kexts are uptodate:
View attachment 540368

I'm runnig MacOS 12.1. There is a graphic output, but without Metal support/hardware accelleration and everything is very laggi. Any ideas?

The Sage boards use plx chips that add extra pci-bridges you have to account for.
Try the modified SSDT attached and double check your path for device properties.
 

Attachments

  • SSDT-BRG0-6900XT.aml
    276 bytes · Views: 112
Last edited:
This seems to work. Thank you! I was able to make a quick test. But the Geekbench Metal score is only around 160000 which seems to low for a XTXH Card :think:
 
The Sage boards use plx chips that add extra pci-bridges you have to account for.
Try the modified SSDT attached and double check your path for device properties.
HI djlild7hina could you have a look at my IOReg please I have similar prob as jan2ooo with device_id 73af for Msi rx 6900 xt.thanks for any help
 

Attachments

  • Mac Pro.zip
    953.4 KB · Views: 54
HI djlild7hina could you have a look at my IOReg please I have similar prob as jan2ooo with device_id 73af for Msi rx 6900 xt.thanks for any help

Should be something like this
 

Attachments

  • SSDT-BRG0.aml
    108 bytes · Views: 82
@zappy39 What's your Geekbench Metal Score? I am a bit disappointed compared to other users.
 
I don't see any AGPM section below the framebuffer section in the ioreg. Does it need to be injected? Or something changed with new Navi cards on macOS? 6900XT - 73BF MacPro7,1 SMBios: works with weg + pikera or also works with w/o weg.
 
Last edited:
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