requency control - and many are unstable. If your System locks-Hard - you have a bad implementation :)
S... default - then change to:
root # cd /sys/devices/system/cpu/cpu0/cpufreq/
cpufreq # ls
affected_ cpuinfo... # cat scaling_available_governors
userspace
The System will set the speed up to 800MHz in this special c... uency. In short - it will dynamically monitor the system load and regulate the CPU Frequency accordingly.