Hardware Acceleration unavailable with Radeon RX 6800 XT 16GB

[thedeermunk]

Hi everyone, I'm having trouble trying to get my hardware acceleration to work with my Radeon RX 6800 XT 16GB. Not that you would be able to tell. My build seems to function well enough playing a video on one monitor while using photoshop on another. The fans on my GPU sit idle and tell a different story while the case fans whirl up. Any help would be appreciated.

 

[Edhawk]

Have you tried using the 'Refresh' icons in videoProc to see if the app finds your RX 6800 XT?

If that doesn't work try the fix below:

The PCIDevices.txt file you provided shows your RX6800XT has a 'Bridge' entry in the IOReg Name. This means you need to generate a custom SSDT-Bridge.aml table to help your system work correctly with your dGPU.

1. If you download and open Corpnewt's SSDTTime python script.
   1. https://github.com/corpnewt/SSDTTime
   2. Select the Green button named 'Code', then select Download Zip.
2. Open SSDTTime.command
3. Select Option 9
4. Then drag and drop your system DSDT.aml on the Terminal/Powershell window
5. When asked copy and paste the Device Path for your RX 6800 XT.
   1. PciRoot(0x0)/Pci(0x1,0x0)/Pci(0x0,0x0)/Pci(0x0,0x0)/Pci(0x0,0x0)
6. The scrip should be able to generate a Custom SSDT-Bridge for your RX 6800XT to fix the missing section of the IOReg Name.

Select Option 9 in the macOS version, as shown in the screenshot below.


Add the SSDT-Bridge.aml created in the Results folder within the SSDTime-Master folder,to your OpenCore /EFI/OC/ACPI folder. Along with a corresponding entry in your config.plist for the new SSDT.

See if this helps.