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

[bugzilla-daemon at freedesktop.org]

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 at lists.freedesktop.org
          Reporter: andrey.arapov at 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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