The Notes

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====== Scripts for controlling Intel CPU frequency ======
My laptop is a Lenovo T440p with a i7-4900MQ. I run Folding@Home on two of my CPU cores. The CPU constantly overheats, and my fan is always spinning at 4440 RPM. I find the noise annoying. Here is what I have done to alleviate the problem. 

===== Enable or disable Intel Turbo Boost(TM) =====
<code bash>
#!/bin/bash
    echo "Intel Turbo Boost(TM) Status:"
    if [[ $1 == "off" ]]; then
        echo 1 > /sys/devices/system/cpu/intel_pstate/no_turbo
    fi
    if [[ $1 == "on" ]]; then
        echo 0 > /sys/devices/system/cpu/intel_pstate/no_turbo
    fi

    state=$( cat /sys/devices/system/cpu/intel_pstate/no_turbo )
    if [[ $state -eq 1 ]]; then
        echo "Off"
    else
        echo "On"
    fi

</code>

===== Setting maximum CPU frequency =====
<code bash>
#!/bin/bash

if ! [[ -z $@ ]]; then
  for i in {0..7} ; do
    echo $@00000 > /sys/devices/system/cpu/cpufreq/policy${i}/scaling_max_freq
  done
fi

cpufreq-info | grep "current policy" | head -1 | cut -d ' ' -f 3-
</code>

===== Setting CPU frequency governor =====
<code bash>
#!/bin/bash
if ! [[ -z $@ ]]; then
  for i in {0..7} ; do
    cpufreq-set -c $i -g $@
  done
fi

cpufreq-info | grep "The governor" | head -1 | cut -d ' ' -f 19-
</code>