[bug report]: Black screen in 5.10

[Alex Deucher]

On Thu, Dec 17, 2020 at 10:15 AM Klaus Kusche
<klaus.kusche at computerix.info> wrote:
>
>
> Hello,
>
> I don't know where and how to report amdgpu bugs
> as the freedesktop.org bugzilla is closed...

https://gitlab.freedesktop.org/drm/amd/-/issues


>
> My problem:
>
> With kernel 5.10.x, both the internal notebook display and any external screen
> become black (or go to the "off" state?) when the kernel boots
> (one or two seconds after the VGA text console is shown),
> and the system no longer reacts.
>
> 5.9.x is fine.
>
> This seems to happen as soon as the amdgpu kernel driver loads/initializes,
> even in pure text mode (VGA console or framebuffer), without starting X.
>
> Dell Precision notebook with
> AMD Radeon (TM) Pro WX 3200 Series (POLARIS12, DRM 3.39.0, 5.9.15-gentoo, LLVM 11.0.0) (0x6981)
>
> Tried all combinations of DC/non-DC, FB/non-FB kernel configurations
> (even happens when configuring Amdgpu without framebuffer!).

I think this may be the same issue as:
https://patchwork.freedesktop.org/patch/408230/
Does the patch there help?  It's already on it's way upstream.

Alex

>
> Many thanks for any help!
>
> --
> Prof. Dr. Klaus Kusche
> Private address: Rosenberg 41, 07546 Gera, Germany
> +49 365 20413058 klaus.kusche at computerix.info https://www.computerix.info
> Office address: DHGE Gera, Weg der Freundschaft 4, 07546 Gera, Germany
> +49 365 4341 306 klaus.kusche at dhge.de https://www.dhge.de
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