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Power management on Pentium 4 M & Celeron M CPUs
Enabling the module
Insert the p4_clockmod module:
sudo modprobe p4_clockmod
This shouldn't return any output.
Setting it to start at boot
Add the line
p4_clockmod
to /etc/modules to ensure the CPU clock scaling module starts with the system.
Adding the CPU frequency scaling monitor applet to the panel (right click 'add to panel') will show CPU frequency now. Reboot the PC if it doesn't seem to be working immediately.
Changing CPU frequency manually
sudo cpufreq-selector -f 1000000