sudo -s
echo > /etc/acpi/ac.d/90-cpufreq.sh '#!/bin/sh'
echo >> /etc/acpi/ac.d/90-cpufreq.sh '/usr/bin/cpufreq-selector -f 900000'
echo > /etc/acpi/battery.d/90-cpufreq.sh '#!/bin/sh'
echo >> /etc/acpi/battery.d/90-cpufreq.sh '/usr/bin/cpufreq-selector -f 450000'
chmod +x /etc/acpi/ac.d/90-cpufreq.sh
chmod +x /etc/acpi/battery.d/90-cpufreq.sh
exit