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Radeon RX 4XX/5XX standalone system, AMDRadeonX4250.kext (GVA support H264) does not support HEVC HW

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Hi guys,
I hope someone can help me
First of all, my components are :

Asus Sabertooth P67
Intel i5 2500k
Ati Radeon RX580 Nitro+
SMBios : iMacPro1,1

Everything works perfectly on Monteray and BigSur, except h264 rendering ... VideoProc (everything is green and supported) , Davinci resolve, FCPX, Mediaencoder... every single program freeze and then restart the computerwhen try to render anything in h264. H265 working perfectly.
I tried to change smbios, tried iMacPro1,1 , MacPro6,1 and 7,1, same thing.
Tried several bootflags in bootloader, and nothingworks
Just to say, OPencore is on the latest version, as all the kexts.

I hope someone have some idea how to resolve this.

Thanks in advance!
disable IGPU in the bios
 
There is nothing in the manual, i checked... only mention for multi gpu (crossfire and SLI)
I checked again in the BIOS, nothing about iGPU. Can i put some flag in boot for disabling igpu that way?
 
There is nothing in the manual, i checked... only mention for multi gpu (crossfire and SLI)
I checked again in the BIOS, nothing about iGPU. Can i put some flag in boot for disabling igpu that way?
-wegnoigpu
 
I will try. Thank you very much
 
I will try. Thank you very much

Section 3.5.2 of the ASUS User Manual in English, shows you how to choose the GPU.
 
Section 3.5.2 of the ASUS User Manual in English, shows you how to choose the GPU.
I saw that but there is nothing about iGPU, PEG (PCi Express Graphic) and PCI ...
I tried both variants, same thing...
 
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