If you want to display and change your CPU frequency under Ubuntu 11.04 (Unity), then use the CPU Frequency indicator.

So, open the Terminal and run these commands:

 sudo add-apt-repository ppa:artfwo/ppa
 sudo apt-get update
 sudo apt-get install indicator-cpufreq

To start this indicator applet, run simply this command via the Terminal:


Or create a launcher on your desktop using the same command. Once launched, an icon will be displayed in the notification area, click it to view proposed CPU frequencies:

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