[bug report]: Black screen in 5.10

[Alex Deucher]

On Thu, Dec 17, 2020 at 1:14 PM Klaus Kusche
<klaus.kusche at computerix.info> wrote:
>
>
> Hello,
>
> On 17/12/2020 16:17, Alex Deucher wrote:
> > On Thu, Dec 17, 2020 at 10:15 AM Klaus Kusche
> > <klaus.kusche at computerix.info> wrote:
> >> 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.
> The patch fixes it. 5.10.1 works fine for me now.
>
> Will 5.10.2 contain the patch or shall I skip 5.10.2 ?

Not sure.  Depends how soon the patch makes it into stable.  If not
.2, then hopefully .3.

Alex


>
> --
> 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