So I installed your binary and my S5 fan shot up to 100% and stayed there, even though I have it set to 20% in the UI. Just to make sure that really was what caused it, I unplugged the S5, plugged it back in and it started up with fans at 20% like usual. I re-installed the binary, restarted cgminer and it was back to 100%.
Is there a fan speed flag or something I'm missing? 20% I can deal with... 100%? Not so much when it sits with me in my office

Been a very long time since I had anything to do with the S5 since I made that binary sorry. I had heard that fan control could not be set by the interface with it (going back to auto?) so there's not much I can do about it now.