monitor power interval
The <monitor power interval> inspectors return information about the monitors (displays) attached to a given computer. Each computer can have multiple monitors, and they can be either on or off. This information can be used in a power-usage study. Monitor intervals are retrieved as tuples in the form of <interval, state, monitor count>, where the interval contains the start and end time, the state (on or off) and the number of monitors that are attached to the computer.