This especially happens when I watch a video with movie player or adobe flash, it uses more than 60% of my Core i5 cpu. (thats the least, it goes up after that)
In windows when I watch the same movie or flash video, it is about 20% cpu usage.
I have tried many those power managerment things in the Ubuntu Wiki https://wiki.ubuntu.com/Kernel/PowerManagement and they did not help.
My laptops is Toshiba Sattelite P745 - Core i5 6GB Ram