The Linux Thermal Daemon program from 01.org

Thermald deals with thermal issues for intel processor families codenamed 
intel sandy-bridge and above.
Its is a Linux daemon used to prevent the overheating of systems.
This daemon monitors temperature and applies compensation using available 
cooling methods.

Uses intel p-state driver.

Prerequisites:

Kernel
  Need kernel with "Intel P State driver", to use Intel P state driver to 
    cool the system.
  Intel Power clamp driver: To use Idle injection to cool the system.
  CONFIG_X86_MSR, so that x86 MSR can be read/write from user space to 
    control P-States.