The following may or may not be relevant to this issue. "Fixes for SI fan handling" http://cgit.freedesktop.org/%7Eagd5f/linux/commit/?h=drm-next-3.20-wip&id=e06b000d6619ac9b60b0724c82dc58141a86a3dc "Enable smc fan control on SI" http://cgit.freedesktop.org/%7Eagd5f/linux/commit/?h=drm-next-3.20-wip&id=bdf40b0fa6588ea64ccb069de63d16f9348aeef6