https://bugzilla.kernel.org/show_bug.cgi?id=207383
--- Comment #13 from Duncan (1i5t5.duncan@cox.net) --- Well, so much for /that/ bisect! Took me a few hours but then had the graphics stall twice in a few minutes... with the above commit reverted AND with memory compression off.
So it's back to square one, except I know that my originally chosen new memory compression options aren't involved. New bisect time.