Abstract: A computer operating system is coupled to intelligent peripheral devices via a peripheral bus architecture that supports unsolicited status requests from peripheral devices. Each peripheral device has local power management that initiates an unsolicited power change request when the device is preparing to change power states. The peripheral bus carries the unsolicited power change request to the operating system. Upon receipt, the operating system issues a power change request directing the peripheral device to perform the power state transition. In this manner, the operating system remains aware of the peripheral device's power state and acts as if it is controlling the device's power state transitions.

Abstract: A computer operating system is coupled to intelligent peripheral devices via a peripheral bus architecture that supports unsolicited status requests from peripheral devices. Each peripheral device has local power management that initiates an unsolicited power change request when the device is preparing to change power states. The peripheral bus carries the unsolicited power change request to the operating system. Upon receipt, the operating system issues a power change request directing the peripheral device to perform the power state transition. In this manner, the operating system remains aware of the peripheral device's power state and acts as if it is controlling the device's power state transitions.