Modifying PROCTHROTTLEMAX with powercfg has no effect in 2008 R2

Question

I am trying to make the CPU transition to a lower P-state. I used pwrtest to determine the tests, and now I want to set the processor frequency to 50%.

I executed the following command:

powercfg -setacvalueindex SCHEME_BALANCED SUB_PROCESSOR PROCTHROTTLEMAX 50

When i query the scheme, the value is set to the desired value. However, the processor frequency is not modified (I am using CPU-Z to check the frequency).

My system is running Windows 2008 R2.

Any ideas? Thanks!

Answer 1

I figured it out. You have to call

powercfg.exe -setactive SCHEME_CURRENT

to apply the changes