Dynamic adjustment of CPU clock speed to prevent notebook overheating and shutdown by AC adapter

Abstract

In this paper we integrate a lower-power EC (Embedded Controller) and a BIOS (Basic Input Output System) to dynamically adjust both processor performance and power consumption of a notebook system. Our design prevents the notebook system from shutting down due to overheating. We utilize the EC to detect the total power of the system. When the total power exceeds the limit of the AC adapter for an excessive period of time, the EC notifies the BIOS which dynamically adjusts the clock frequency of the CPU to allow a total power reduction whilst maintaining sufficient power so that the system doesn't lag. Our design maintains a level of high performance during a reasonable interval, and without over-design of the AC adapter. In addition our design reduces both the cost and the size of the AC adapter for notebook users.