#!/usr/bin/env bash
#
# script to change the power and cpu throttle governor
# with new intel_pstates. use at your own risk
# this also uses the 'old' cpufreq-set to ensure that
# also the 'old' system is set the same way.

if [[ -z $1 ]]; then
	echo "error. no argument."
	echo "use [performance|default|power]"
else

    if [[ $1 == "performance" ]]
    then

        for i in /sys/bus/cpu/devices/cpu*
        do
            CPU=`echo "${i: -1}"`
            sudo cpufreq-set -c $CPU -g performance
        done

        sudo x86_energy_perf_policy --turbo-enable 1
        sudo x86_energy_perf_policy -a performance

        watch cat /sys/devices/system/cpu/cpu[0-9]*/cpufreq/scaling_cur_freq

    elif [[ $1 == "default" ]]
    then

        for i in /sys/bus/cpu/devices/cpu*
        do
            CPU=`echo "${i: -1}"`
            sudo cpufreq-set -c $CPU -g powersave
        done

        sudo x86_energy_perf_policy --turbo-enable 0
        sudo x86_energy_perf_policy -a default

        watch cat /sys/devices/system/cpu/cpu[0-9]*/cpufreq/scaling_cur_freq

    elif [[ $1 == "power" ]]
    then

        for i in /sys/bus/cpu/devices/cpu*
        do
            CPU=`echo "${i: -1}"`
            sudo cpufreq-set -c $CPU -g powersave
        done

        sudo x86_energy_perf_policy --turbo-enable 0
        sudo x86_energy_perf_policy -a power

        watch cat /sys/devices/system/cpu/cpu[0-9]*/cpufreq/scaling_cur_freq

    else

	    echo "error. no match."
	    echo "use [performance|default|power]"

    fi
fi