CONTROLLING TRANSITIONS OF DEVICES BETWEEN NORMAL STATE AND QUIESCENT STATE

摘要

A data processing apparatus has a number of devices having a normal state and a quiescent state in which the device is ready for being placed in a power saving state. Each device provides at least one preference indication indicative of a preference to operate in the normal state or the quiescent state. A controller controls a common state transition process for transitioning each of the devices between the normal state and the quiescent state based on the preference indication received from each device.