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

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Date:   Tue, 27 Dec 2022 10:55:43 -0500
From:   Alex Deucher <alexdeucher@...il.com>
To:     Aditya Garg <gargaditya08@...e.com>
Cc:     "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>,
        Orlando Chamberlain <redecorating@...tonmail.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "amd-gfx@...ts.freedesktop.org" <amd-gfx@...ts.freedesktop.org>
Subject: Re: [BUG] AMD Radeon Pro 5600M with 8GB of HBM2 memory shows blank
 screen on Linux

On Mon, Dec 26, 2022 at 8:19 AM Aditya Garg <gargaditya08@...e.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