https://bugs.freedesktop.org/show_bug.cgi?id=68178
--- Comment #9 from Alex Deucher agd5f@yahoo.com --- THe only thing that has changed in the ucode is adding new ucode for UVD and SMC. If you use the newer firmware package but remove the UVD and/or SMC ucode images, you should get the same behavior as with the old firmware package. Since dpm is not enabled by default, I think the problem is probably with UVD.