[Bug 108693] black screen with "drm/amd/display: Do not limit color depth to 8bpc" e03fd3f300f6184c1264186a4c815e93bf658abb >=4.18

[Bug 108693] black screen with "drm/amd/display: Do not limit color depth to 8bpc" e03fd3f300f6184c1264186a4c815e93bf658abb >=4.18

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https://bugs.freedesktop.org/show_bug.cgi?id=108693

            Bug ID: 108693
           Summary: black screen with "drm/amd/display: Do not limit color
                    depth to 8bpc"
                    e03fd3f300f6184c1264186a4c815e93bf658abb >=4.18
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: andrey.arapov@nixaid.com

Hello,

some of the MacBookPro 14,3 users have been struggling with the black screen
issue on their systems, I have been bisecting the kernel commits that came to
v4.18-rc1 and found that the problem is gone when I revert this commit
"drm/amd/display: Do not limit color depth to 8bpc"
e03fd3f300f6184c1264186a4c815e93bf658abb

I presume that the driver cannot get the display_info.bpc from the screen so it
defaults to COLOR_DEPTH_UNDEFINED causing the black screen.

Please let me know,

https://github.com/torvalds/linux/commit/e03fd3f300f6184c1264186a4c815e93bf658abb

Followed-by
https://github.com/Dunedan/mbp-2016-linux/issues/73#issuecomment-422397681

Kind Regards,
Andrey Arapov

P.S. I have been sending an email to Harry Wentland & Alex Deucher on 18 Sept.
2018, but no response followed.

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[Bug 108693] black screen with "drm/amd/display: Do not limit color depth to 8bpc" e03fd3f300f6184c1264186a4c815e93bf658abb >=4.18

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https://bugs.freedesktop.org/show_bug.cgi?id=108693

--- Comment #1 from Ronny Standtke <ronny.standtke@gmx.net> ---
I can confirm the bug. We provide an exam environment based on Debian Live.
Since we switched to Kernel 4.18 (provided in Debian backports) we have seen
*many* Macs failing to boot and just showing a black screen. So at least for us
this regression is quite severe...

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[Bug 108693] black screen with "drm/amd/display: Do not limit color depth to 8bpc" e03fd3f300f6184c1264186a4c815e93bf658abb >=4.18

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https://bugs.freedesktop.org/show_bug.cgi?id=108693

--- Comment #2 from Alex Deucher <alexdeucher@gmail.com> ---
This patchset may help:
https://patchwork.freedesktop.org/series/52164/

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[Bug 108693] black screen with "drm/amd/display: Do not limit color depth to 8bpc" e03fd3f300f6184c1264186a4c815e93bf658abb >=4.18

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https://bugs.freedesktop.org/show_bug.cgi?id=108693

--- Comment #3 from Andrey Arapov <andrey.arapov@nixaid.com> ---
(In reply to Alex Deucher from comment #2)
> This patchset may help:
> https://patchwork.freedesktop.org/series/52164/

Thank you, Alex.

I can confirm, the patches worked for me.
I have adapted them for Linux 4.19.2 - 
https://gist.github.com/arno01/8115ef124fe7f42bbf1c317892013e86


Any plans for including them in the next Linux release?

Kind Regards,
Andrey Arapov

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[Bug 108693] black screen with "drm/amd/display: Do not limit color depth to 8bpc" e03fd3f300f6184c1264186a4c815e93bf658abb >=4.18

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https://bugs.freedesktop.org/show_bug.cgi?id=108693

--- Comment #4 from Alex Deucher <alexdeucher@gmail.com> ---
(In reply to Andrey Arapov from comment #3)
> (In reply to Alex Deucher from comment #2)
> > This patchset may help:
> > https://patchwork.freedesktop.org/series/52164/
> 
> Thank you, Alex.
> 
> I can confirm, the patches worked for me.
> I have adapted them for Linux 4.19.2 - 
> https://gist.github.com/arno01/8115ef124fe7f42bbf1c317892013e86
> 
> 
> Any plans for including them in the next Linux release?

yes.  They should land in 4.20 soon.

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[Bug 108693] black screen with "drm/amd/display: Do not limit color depth to 8bpc" e03fd3f300f6184c1264186a4c815e93bf658abb >=4.18

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https://bugs.freedesktop.org/show_bug.cgi?id=108693

Martin Peres <martin.peres@free.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |MOVED

--- Comment #5 from Martin Peres <martin.peres@free.fr> ---
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been
closed from further activity.

You can subscribe and participate further through the new bug through this link
to our GitLab instance: https://gitlab.freedesktop.org/drm/amd/issues/602.

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