Disabling power management firmware decisions

[Daniel Lezcano <daniel.lezcano@linaro.org>]

Hi,

I would like to do some experiments with the x86 platform but I am 
facing one big issue.

When I use the rapl register to measure the energy consumption with 
turbostat and another tool written by me. I see no differences between 
my kernel changes while using the idlestat tool, I see big differences 
in the idle state durations with the traces.

I remember on x86 the firmware overrides all kernel decisions to do the 
power management. So I assume, it is possible my changes are not 
measurable because of that.

Is there a way to tell the firmware to stop overriding the kernel 
decisions in order to let the kernel handle idle/dvfs on its own ?

Thanks

   -- Daniel


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