Comment # 42 on bug 106940 from SET

(In reply to Andrey Arapov from comment #41)
> Not sure if that helps, but could you try reverting this commit?
> https://github.com/torvalds/linux/commit/
> e03fd3f300f6184c1264186a4c815e93bf658abb
> 

Reverted that commit, still a black screen with 4.19-rc4 in the above context.
Using radeon for a useful laptop.