Summary
The CPU frequency governor feature is enabled in kernel configuration by default, The available frequencies are: 98000 198000 398000 598000 747500 1040000 1196000 1300000
Below is a vedio to show how to use it.
http://pan.baidu.com/s/1o7XnyyQ
Also you can configure it by using following command:
cat /sys/devices/system/cpu/cpufreq/policy0/scaling_cur_freq
1300000
cat /sys/devices/system/cpu/cpufreq/policy0/scaling_available_governors
interactive conservative ondemand userspace powersave performance sched
cat /sys/devices/system/cpu/cpufreq/policy0/scaling_governor
performance
echo userspace > /sys/devices/system/cpu/cpufreq/policy0/scaling_governor
cat /sys/devices/system/cpu/cpufreq/policy0/scaling_available_frequencie
echo 598000 > /sys/devices/system/cpu/cpufreq/policy0/scaling_setspeed
