https://bugs.freedesktop.org/show_bug.cgi?id=95474
--- Comment #8 from Jan Ziak 0xe2.0x9a.0x9b@gmail.com --- (In reply to Alex Deucher from comment #4)
Can you try a different kernel or mesa version?
Kernel 4.4.6 radeon.ko + LLVM 3.8 + Mesa 11.2.2 -> same result