[BUG] AMD Radeon Pro 5600M with 8GB of HBM2 memory shows blank screen on Linux

[Aditya Garg]

The AMD Radeon Pro 5600M with 8GB of HBM2 memory GPU is found in MacBook Pro 16 inch, 2019 (MacBookPro16,4).

The GPU fails to work on Linux, thus a blank black screen gets displayed on boot.

If nomodeset is added as a kernel parameter, we are able to access Linux easily.

The link below contains the journalctl of the failed boot :-
https://gist.github.com/AdityaGarg8/dfe1a1c23bf2b92b640dad89f55b73c7

Thanks
Aditya