Comment # 7 on bug 104888 from Robin Kauffman

Works with current-ish drm-next-4.18-next commit
(52132fd03504140b4cc58c01b19e82929a03af7a), most recent issue was an omission
on my part (failing to put consoleblank=600 (or some other non-zero integer
value) in the kernel commandline).  Don't know which commit fixed things, as I
haven't bisected my way through a few (at least) weeks of commit history.  I
can have a go at it if someone really wants me to.