This is a great option for laptops, using this myself atm and works like acharm.
Been checking cpu governor in terminal to see that its correct and it is, so check my previous post for more power on the Wifi on battery and install this.
Small lite indicator that wrks in Unity (Ubuntu 14.04)
Tweak your CPU frequency with
indicator-cpufreq will help you change your CPU frequency on the go:
sudo apt-get install indicator-cpufreq
Go to Dash > search for Startup > edit
-f or copy paste the following command:
With the indicator you will be able to monitor your current CPU frequency & can change CPU frequency
Changing CPU frequency
Click on indicator