https://bugs.freedesktop.org/show_bug.cgi?id=106940
--- Comment #41 from Andrey Arapov andrey.arapov@nixaid.com --- Not sure if that helps, but could you try reverting this commit? https://github.com/torvalds/linux/commit/e03fd3f300f6184c1264186a4c815e93bf6...
My MacBookPro Mid 2017 started to experience the black screen issue since 4.18.0-rc1 up to 4.19.0-rc4 (and probably higher). Having that commit reverted has resolved the black screen issue I had, allowing me to use amdgpu.dc=1 again.
Refs:
- https://github.com/Dunedan/mbp-2016-linux/issues/73#issuecomment-422397681