On Supermicro C7H61, BIOS version 2.00 dated 11/02/2012 or 2.0b dated 03/29/2013, with i7-3770K CPU, the following error message is seen repeatedly:
Timed out waiting for forcewake old ack to clear
On a heavily loaded system, this can result in a hangup within a few minutes.
Reverting commit 36ec8f877 (drm/i915: unconditionally use mt forcewake on hsw/ivb) fixes the problem.
Partial revert merged to -fixes, with cc: stable added.
Author: Guenter Roeck <firstname.lastname@example.org>
Date: Tue Jul 9 16:00:31 2013 -0700
Partially revert "drm/i915: unconditionally use mt forcewake on hsw/ivb"
The new kernel does not fix the bug. I and a few on the Ubuntu tracker have found that it still exhibits the same occasional, seemingly random issues with the infinite loop. https://goo.gl/KyvnZF
The link in comment 2 pooints to a research paper writing service, making me wonder if the post is clickbait / spam.