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Date: Wed, 20 Jun 2018 14:43:48 -0500
From: Vincent Stemen <vince@hightek.org>
To: freebsd-stable@FreeBSD.ORG
Subject: Re: ATI video problem - extremely slow desktop - 100% cpu load
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I have now tested with two additional ATI cards.
A Radeon HD 5450 and and older card that shows as 
"RV370 [Radeon X300 SE]" in the PCI info.

Same problem on all of them.  Before, it would come up and run correctly
once in a while.  It doesn't seem to at all now.  This seems to be some
kind of core radeon driver bug.