cannot change CPU min frequency

[dronkit]

I'm using CM13 2016-10-13 and Kernel Adiutor, and I can't change the CPU minimum frequency. It's at 1881 MHz and when I try to set it lower, it changes for a fraction of a second, then back to 1881.
There's very little abot this on the internet. Some blame MPDecision but this problem happens even with MPDecision turned off. I also tried turning off CPU boost.
I tried it with CM13's original kernel, an unofficial boeffla kernel for g900v, and the official boeffla for g900f.

Any ideas?

 

[dronkit]

I want to report that the issue goes away when I disable "VDD control" in "thermal" options in Kernel Adiutor. No idea why.