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get information about current cpu usage/frequency and so on.

cpupower frequency-info

change cpu clock speed

max power save (performance bias). this goes from 0 to 15 where 0 is for most performance and 15 for most power saving:

sudo cpupower set -b 15

verify if it was set correctly with sudo cpupower -c all info -b

set fixed cpu frequency:

sudo cpupower frequency-set --max 2000 MHz

get available cpu governors:

sudo cpupower frequency-info -g

set specific cpu governor

-c all will apply the governor to all cpus

sudo cpupower -c all frequency-set -g powersave