[IMAGE] Did you try enabling the option above? That gave me access to the fans on my 8940 but it's either 100% or "idle". Can't control exactly.
Is there any way to manually control the fan speed on the CPU fans? I have found a way to control the GPU fans, but not the CPU fans. I have tried using SpeedFan, but it was unable to detect any fans. 
XPS 8950, manual CPU fan control?