https://bugs.freedesktop.org/show_bug.cgi?id=80584
--- Comment #5 from dex+fdobugzilla@dragonslave.de --- I can confirm this for PITCAIRN as well.
Card: VGA compatible controller: Advanced Micro Devices [AMD] nee ATI Pitcairn Subsystem: Micro-Star International Co., Ltd. Device 3036
Kernel: 3.18.0-rc7 libdrm: 2.4.58 mesa: git-gc97cbd7 llvm: 3.5