A computer system with a ring detection facility to initiate a system wakeup procedure

摘要

The present invention relates to a computer system having a CPU, a power management processor, an external signal reception means such as a modem, and a power supply in circuit communication. The power management processor controls the regulation of power to the CPU by the power supply. In preferred embodiments, responsive to a ring signal having a frequency in a predetermined range being detected by the power management processor, the power management processor causes the power supply to provide regulated power to the computer system. Thereafter, the CPU preferably confirms that a ring signal was present by querying the modem to determine whether the modem also detected a ring. If so, the system remains powered. If not, the CPU causes the power management controller to cause the power supply to cease providing regulated power. <MATH>