Sets upper limit for CPU frequency via TLP. EXPERIMENTAL

tlp-limit-cpu-freq.sh

#!/bin/bash
#
# Sets upper limit for CPU clock speed with TLP config.
set -e

# Variables
#####################
reload=false
conf="/etc/tlp.conf"
PS3="Select max CPU frequency: "
FREQS=("2100000" "2300000")
current_value_ac=$(grep -0 "CPU_SCALING_MAX_FREQ_ON_AC=*" $conf)
current_value_bat=$(grep -0 "CPU_SCALING_MAX_FREQ_ON_BAT=*" $conf)

# Script
#####################
echo -e "Current value on AC: $current_value_ac"
echo -e "Current value on BAT: $current_value_bat\n"


# Menu
select opt in "${FREQS[@]}";
do

  echo -e "\nApplying selected value ($opt)..."

  # AC state
  if grep -q "CPU_SCALING_MAX_FREQ_ON_AC=$opt" $conf
  then
    echo -e "\nThis value is already the current value for AC power state."
  else
    sed -i "s/CPU_SCALING_MAX_FREQ_ON_AC=.*/CPU_SCALING_MAX_FREQ_ON_AC=$opt/g" $conf
    echo -e "\nApplied value for AC power state."
    reload=true
  fi

  # BAT state
  if grep -q "CPU_SCALING_MAX_FREQ_ON_BAT=$opt" $conf
  then
    echo "This value is already the current value for BAT power state."
  else
    sed -i "s/CPU_SCALING_MAX_FREQ_ON_BAT=.*/CPU_SCALING_MAX_FREQ_ON_BAT=$opt/g" $conf
    echo "Applied value for BAT power state."
    reload=true
  fi

  if [ $reload = true ]
  then
    echo -e "\nReloading TLP config..."
    sudo tlp start
  fi

  echo -e "\nOperation succesful"
  break
done