Kaby Lake-R UHD620 Spoofing cause IOGFlags 0x3 (0x51)

[Mattuz]

Hello everyone, I'm currently trying to get monterey working on my Dell Xps 13 9360 (i7-8550u/UHD620). I found many efis from other users that didn't work for me and I tried to create one myself.
I noticed that if I put device-id 16590000 as listed on WhateverGreen's faq I get stuck at IOGFlags 0x3 (0x51) during boot.
I can boot without the device-id but I have not graphics acceleration.
The issue was solved by changing SMBIOS. But hardware acceleration is still not working as the dock has a solid background and system info says "Intel UHD Graphics 620 21MB".
What would you suggest to do?

Thank you in advance

 

[Evaristtandika]

have you solved ?

 

[Mattuz]

have you solved ?

Yes changing the BIOS variables to increase the DVMT Pre-Allocated memory is mandatory. There's no other fix.