CPU frequency scaling for Core 2 Duo
1- use acpi-cpufreq kernel module :
modprobe acpi-freq
2- use ondemand scaling governor :
echo ondemand > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
echo ondemand > /sys/devices/system/cpu/cpu1/cpufreq/scaling_governor
3- or use conservative scaling governor :
echo conservative > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
echo conservative > /sys/devices/system/cpu/cpu1/cpufreq/scaling_governor