[Bug 108693] black screen with "drm/amd/display: Do not limit color depth to 8bpc" e03fd3f300f6184c1264186a4c815e93bf658abb >=4.18
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/e03fd3f300f6184c1264186a4c815e93bf6...
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.
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...
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/
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
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)
yes. They should land in 4.20 soon.
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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