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From:   Alex Deucher <alexdeucher@gmail.com>
Date:   Tue, 27 Dec 2022 10:55:43 -0500
Message-ID: <CADnq5_NiDE7a5dmhhuLntQe88DS5JmiZTGqQ6ongXuWyh1A4wg@mail.gmail.com>
Subject: Re: [BUG] AMD Radeon Pro 5600M with 8GB of HBM2 memory shows blank
 screen on Linux
To:     Aditya Garg <gargaditya08@live.com>
Cc:     "harry.wentland@amd.com" <harry.wentland@amd.com>,
        "sunpeng.li@amd.com" <sunpeng.li@amd.com>,
        "Rodrigo.Siqueira@amd.com" <Rodrigo.Siqueira@amd.com>,
        "alexander.deucher@amd.com" <alexander.deucher@amd.com>,
        "christian.koenig@amd.com" <christian.koenig@amd.com>,
        "Xinhui.Pan@amd.com" <Xinhui.Pan@amd.com>,
        Orlando Chamberlain <redecorating@protonmail.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "amd-gfx@lists.freedesktop.org" <amd-gfx@lists.freedesktop.org>
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On Mon, Dec 26, 2022 at 8:19 AM Aditya Garg <gargaditya08@live.com> wrote:
>
> 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

Can you file a bug report:
https://gitlab.freedesktop.org/drm/amd/-/issues/

What sort of monitor are you using?  It looks to be failing mode validation:
[drm] Mode Validation Warning: Urgent latency failed validation.

Alex

>
> Thanks
> Aditya