[Success] Radeon RX 6800 XT - Big Sur

[nathanaelweir]

Hey @tedyun,

So i ended up just implementing your SSDT and then added the fields to my config.plist as per your outline using Propertree. I ensured the correct PCI path as per OCC.

I have no idea if the SSDT is modified properly as you've pointed out as per my ASUS mb? But it certainly made a difference to the graphics when i implemented it.. And my About This Mac has picked up on the card.

How can i double check it's all correct? Or do you think the fact it's all working is sweet?

 

[tedyun]

@nathanaelweir -- Interesting! The SSDT should be specific to the motherboard, but since ac9001's is an ASUS as well, they may use the same address. The Gigabytes seem to use the same address.

You can use Hackintool to check. Navigate to the PCIe tab, then look down the list, under "Class" for "Display controller" You should see your card.

Check under "Device" and it should have the spoofed id, "0x73BF" and the IOReg Name should be the correct path. It should end in "...BRG0@0/GFX0@0"

If you upload a screenshot of this tab, we can confirm that the spoof worked correctly.

 

[nathanaelweir]

Hey @tedyun looks correct to me?

 

[jan2ooo]

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:

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

That's the ACPI tree on ASUS X299 Sage10G. And this is the content of my custom SSDT:

Spoiler: SSDT-BRG0-6900XT.aml

/*
 * 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:

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

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

All Kexts are uptodate:

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

 

[tedyun]

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:

Spoiler: SSDT-BRG0-6900XT.aml

/*
 * 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.

 

[djlild7hina]

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:

Spoiler: SSDT-BRG0-6900XT.aml

/*
 * 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.

 

[jan2ooo]

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

 

[Feartech]

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

As per rules, please update your hardware profile to allow others to help you easier

https://www.tonymacx86.com/account/account-details

 

[zappy39]

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

 

[djlild7hina]

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