Lenovo ThinkPad T490 - UDH 620 - iGPU acceleration not working

[mikiotty]

Hi everyone! I'm trying to install macOS on this Lenovo ThinkPad T490 (specs in the signature), but I can't get iGPU acceleration to work.

I tried following the Dortania guide, setting 00009B3E as platform-id and 9B3E0000 as device id, it freezes just before the login screen with these colors/lines on the screen.
I tried changing the IDs according to Whatevergreen's Intel guide for Whiskey Lake laptops, setting 0900A53E as platform-id and A53E0000 as device-id, same result.
I tried a combination of those, even spoofing Kaby Lake or Coffee Lake UDH620s, 630s and 655. Nothing works. The only way I can reach the desktop is by removing the device-id property, but I don't have GPU acceleration of course.

I tried changing SMBIOS from MacBookPro15,4 to 15,2 or even 14,2. No changes.

I also tried DVMT patching, I can set either 256MB or 512MB in the BIOS, but it doesn't work either.

I'm at a dead end, I've been hackintoshing for 7 years now and I never ever faced an issue like this, furthermore a lot of people on this very laptop configuration have macOS running perfectly since Catalina.
Does anyone have any idea? I'm attaching one of the various plist configurations I tried. Thank you!

 

[EliteMacx86]

I also tried DVMT patching, I can set either 256MB or 512MB in the BIOS, but it doesn't work either.

The first thing you should do is flash the latest BIOS.

'm at a dead end, I've been hackintoshing for 7 years now and I never ever faced an issue like this, furthermore a lot of people on this very laptop configuration have macOS running perfectly since Catalina.

It happens. It all depends on the hardware, its limitation, and how well your implementation is.

Does anyone have any idea? I'm attaching one of the various plist configurations I tried. Thank you!

Incomplete PR files attached.

 

[mikiotty]

The first thing you should do is flash the latest BIOS.

It happens. It all depends on the hardware, its limitation, and how well your implementation is.


Incomplete PR files attached.

It's already on the latest official BIOS (v1.77 and 1.26 for EC). I could try and roll back to a previous version to see if it changes anything.
What files do I need to attach?
Thanks

 

[EliteMacx86]

It's already on the latest official BIOS (v1.77 and 1.26 for EC). I could try and roll back to a previous version to see if it changes anything.

As you have attempted to unlock DVMT, the best would be to flash the latest stock BIOS to prevent any issues which might appear during diagnostics.

What files do I need to attach?

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