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

rlxr · Oct 12, 2019

Late to the part, so I am a bit out of the loop. I started reading, but the topic is HUGE.
Can you please let me know- is it possible to bypass the lack of iGPU of my mobo and enable hvec and h264?
My SMBIOS is MacPro6,1. OS is Catalina. I am on my "crusade" to make sidecar working lol

CMMChris · Oct 13, 2019

Use iMacPro1,1 for HEVC acceleration. But you won't be able to get sidecar working. Macs without IGPU use the T2 chip to encode the Sidecar video signal for whatever reason. Maybe there will be a fix for this in he future to force Sidecar rendering on a DGPU.

rlxr · Oct 13, 2019

CMMChris said:
Use iMacPro1,1 for HEVC acceleration. But you won't be able to get sidecar working. Macs without IGPU use the T2 chip to encode the Sidecar video signal for whatever reason. Maybe there will be a fix for this in he future to force Sidecar rendering on a DGPU.

I managed to make sidecar working, but very blurry and bad quality. I found out that I need to enable HEVC and h264 to get it fixed, but I cannot enable igpu, because I don't have any

It currently works only with MacPro6,1 System definition. Any ideas?

estebanpro · Oct 13, 2019

I'm super confused. I have an i7-6700k and RX580, I currently have h.264 acceleration enabled with the shikigva=32 boot args and I was wondering how I can enable HEVC encode/decode.

I have the iMac 17,1 profile, is it possible or do I absolutely have to change it to iMacpro1,1?

CyCLoBoT · Oct 13, 2019

estebanpro said:
I'm super confused. I have an i7-6700k and RX580, I currently have h.264 acceleration enabled with the shikigva=32 boot args and I was wondering how I can enable HEVC encode/decode.

I have the iMac 17,1 profile, is it possible or do I absolutely have to change it to iMacpro1,1?

As far as I know, to fully utilize AMD GPU's encoding/decoding capabilities, you would have to use iMacPro1,1 profile. I was not able to get it to work otherwise.

CMMChris · Oct 13, 2019

Sidecar only works with IGPU or T2, not DGPU.

estebanpro · Oct 13, 2019

CyCLoBoT said:
As far as I know, to fully utilize AMD GPU's encoding/decoding capabilities, you would have to use iMacPro1,1 profile. I was not able to get it to work otherwise.

Ah OK. I see. The question I have is am I going to see reduced CPU performance if I switch to the iMacpro1,1 profile With the skylake 6700k?

glofter1 · Oct 13, 2019

estebanpro said:
Ah OK. I see. The question I have is am I going to see reduced CPU performance if I switch to the iMacpro1,1 profile With the skylake 6700k?

I have a perfect 6700K EFI with IGPU + RX480
I will post you later

here you are.. just put kext in L/E
fake / sensor / USB from hacktool / Waterver / lilu / AppleALC

estebanpro · Oct 14, 2019

glofter1 said:
I have a perfect 6700K EFI with IGPU + RX480
I will post you later

here you are.. just put kext in L/E
fake / sensor / USB from hacktool / Waterver / lilu / AppleALC

Thank you for this. I'm not quite sure what you mean. Which Kext do I need from your EFI folder and where do I put it?

glofter1 · Oct 14, 2019

estebanpro said:
Thank you for this. I'm not quite sure what you mean. Which Kext do I need from your EFI folder and where do I put it?

put this one in /L/E

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

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