"which somename must have done" No, I didn't know you can disable it. Thanks for tip. In my setup I use this https://www.techidiots.net/notes/fake-fan-sensor to fake fan speeds.

Ah, I see. There is nothing wrong with hardware solutions, but it just seems easier to me to do a software fix if possible. For example, line 347 in https://github.com/bitmaintech/bmminer-mix/blob/729f03eb99ac8853af2099bc4a49169ba1ebb712/driver-btm-c5.h just needs to have #define