macOS 11.4 RDNA 2

[tom111]

I have the Radeon™ Vega 64 LC in slot 1 and the RX 6900 XT in slot 2.
But the 6900 has no Signal (in Windows it is working).
Do I get a picture, when I put it in slot 1?

 

[Gigamaxx]

I have the Radeon™ Vega 64 LC in slot 1 and the RX 6900 XT in slot 2.
But I the 6900 has no Signal (in Windows it is working).
Do I get a picture, when I put it in slot 1?

Go to the top tool bar and select the Apple, then scroll to About this Mac.
Click on the system report, then go to graphics and displays.
select the 6900 and take a screenshot (CMD+Shift+3) post the screenshot.

It may be device ID is 0x73AF1002.

 

[tom111]

When I add agpmod=pikera then the Vega 64 also has no signal.
This is the system information:

 

[Gigamaxx]

When I add agpmod=pikera then the Vega 64 also has no signal.
This is the system information:

View attachment 516402

Have you tried pikera with the 64 removed. Just the 6900 card and disable IGPU for testing.

Good you have the 0x73BF which is supported.

 

[Jamesbond007]

OP, I think you mean MacOS Big Sur 11.4 (and not 10.4?).

So Apple finally gets around to adding support for AMD RX 6000 series graphics cards in MacOS 11.4 (currently beta):

macOS 11.4 adds support for AMD 'Big Navi' 6800, 6800XT, 6900XT | AppleInsider

Apple released the first developer beta of macOS 11.4 with the ability for Intel-based Macs to connect to GPUs that use AMD Navi RDNA2 architecture.

appleinsider.com

 

[cyberdog]

 

[tom111]

Ah, yes, macOS 11.4 public beta.
The RX 6900 XT is recognized, but I don't even have a black screen. The Monitor has no signal at all. In System Information, as you can see above, no monitor shown for the 6900.

 

[Gigamaxx]

Ah, yes, macOS 11.4 public beta.
The RX 6900 XT is recognized, but I don't even have a black screen. The Monitor has no signal at all. In System Information, as you can see above, no monitor shown for the 6900.

Did you try disabling the IGPU and 6900 in slot 1?

 

[tom111]

I have a picture now, with the Radeon™ 64 LC and the RX 6900 XT activated. (I don't want to remove the Radeon™ 64 LC and then it still does not work).
But I have picture dropouts on the 6900.
What could be the problem?

edit:
Ah, the picture dropouts are caused by interferences that mess up the monitor.
The RX 6900 XT is working now, with the MacPro7,1 (-wegoff + Memory config) and iMac19,1 (agdpmod=pikera) SMBIOS.

 

[gabevf]

I've been having major USB issues after the update.
tried to go back to stock (only using XhciPortLimit + USBInjectAll.kext), and i can't get USB to work at all - no power.

Oddly, with my 6900 XT, my machine only boots with CSM enabled. Otherwise it doesn't even get past the BIOS splash screen.

Anyone else experiencing this? Does CSM have anything to do with USB?

Are there any issues with USB on 11.4 (beta) that I should be aware of?

Edit: I figured it out. The solution was to disable ProtectUefiServices under Booter > Quirks.

CSM Support remains enabled, with the following sub-categories:
– LAN PXE Boot Option ROM: Disabled
– Storage Boot Option Control: Do not launch
– Other PCI devices: Do not launch