Hi Rudolf, Thanks for posting your work! I'm testing it right now. I have a question: > pwm[1-4]_enable - this file controls mode of fan/temperature control: > * 0 Disabled. In fact the pwm is set to 255 > * 1 Manual Mode, write to pwm file any value 0-255 (fullspeed) > * 2 Thermal Cruise > * 3 Smart FAN III There is another mode, RPM Cruise, in the datasheet. Smart Fan 3 is only supported by CPUFANOUT0 and CPUFANOUT1. Tell me what you think, maybe mode 3 should be RPM cruise and mode 4 is either not allowed (-EINVAL) or for the two fans that allow Smart Fan 3, it turns it on. That's all until I get through testing, David