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

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Date:   Mon, 26 Dec 2022 10:44:06 +0000
From:   Aditya Garg <gargaditya08@...e.com>
To:     "harry.wentland@....com" <harry.wentland@....com>,
        "sunpeng.li@....com" <sunpeng.li@....com>,
        "Rodrigo.Siqueira@....com" <Rodrigo.Siqueira@....com>,
        "alexander.deucher@....com" <alexander.deucher@....com>,
        "christian.koenig@....com" <christian.koenig@....com>,
        "Xinhui.Pan@....com" <Xinhui.Pan@....com>
CC:     "amd-gfx@...ts.freedesktop.org" <amd-gfx@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Orlando Chamberlain <redecorating@...tonmail.com>
Subject: [BUG] AMD Radeon Pro 5600M with 8GB of HBM2 memory shows blank screen
 on Linux

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