as for MakeMKV I want to open another tool to Ubuntu users too: PHC. It stands for Processor Hardware Control and, as it's easy to understand, it allows users to customize some features of CPU control in a linux environment, as undervolting.
Gentoo users should look at this specific guide!
!!UPDATED UBUNTU 11.10 VERSION!!!
!!UPDATED UBUNTU 12.04 VERSION!!!
!!UPDATED UBUNTU 11.10 VERSION!!!
!!UPDATED UBUNTU 12.04 VERSION!!!