https://bugs.freedesktop.org/show_bug.cgi?id=60879
--- Comment #122 from benli1392@gmail.com --- Thanks summerrainbowz, I had no idea that was supposed to be for the Kernel. I can also confirm summerrainbowz's results. My dmesg output looks different though.
My setup current is Fedora 23. I compiled and installed mesa, xf86-video-ati, and drm from git master. I also applied the "Tahiti fix v2" patch to vanilla Kernel 4.2 to test. Kernel config settings were identical to Fedora's config. I took out nomodeset from grub boot parameters when testing as well. I am uploading the attached Xorg and dmesg logs.