https://bugs.freedesktop.org/show_bug.cgi?id=99907
--- Comment #12 from saunders.52@wright.edu --- Arch has a testing update (linux-firmware-20170217.12987ca-2) that's the same git revison that was causing problems with the troublesome AMD commits reverted, and this has fixed both my RX 460 GPU hang and the issues with power management on an R9 Fury.