fbsd

#cat>> rc.conf
powerd_enable="YES"
powerd_flags="-a adp -n adp"
#sh /etc/rc.d/powerd start
Starting powerd.
# sysctl dev.cpu | grep freq
dev.cpu.0.freq: 100

# cat>>/boot/device.hints
hint.acpi_throttle.0.disabled="0"
hint.p4tcc.0.disabled="0"

# sysctl dev.cpu
dev.cpu.0.freq_levels: 2200/10575 1925/9253 1900/8030 1662/7026 1600/5842 1400/5111 1300/4085 1137/3574 975/3063 800/2062 700/1804 600/1546 500/1288 400/1031 300/773 200/515 100/257

ded

# apt-get remove cpufrequtils
# apt-get install cpufreqd cpufrequtils lm-sensors

cat /etc/cpufreqd.conf

yum

# yum remove cpufrequtils
# yum install cpupowerutils
# yum install kernel-tools

cat /etc/sysconfig/cpuspeed