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Senin, 13 Februari 2012

Power Management



Power management controls a computers use and conservation of power. Windows 2000 Professional implements a system-wide, integrated approach to power management. In compliance with the OnNow design initiative, the operating systems power management features conserve energy while the computer is working and put the computer to sleep when it is not working. Power management features in Windows 2000 Professional include the following:
System Power Management    The ACPI defines mechanisms for controlling the computers sleep and wake states, allowing any device to wake up the computer.
Device Power Management    Windows 2000 Professional can put a device into a low power state based on the level of usage of the device. The ACPI design separates the decision process from the actual implementation, so decisions regarding a devices power state are made by the component best able to do so.
Processor Power Management    Windows 2000 Professional controls the processors power state, enabling it to meet conservation, thermal, and audible noise goals.
System Events    The ACPI defines a mechanism for handling thermal events, docking, device insertion and removal, and system events.
Battery Management    On an ACPI-compliant computer running Windows 2000 Professional, battery management is provided by the operating system. For example, it is the operating system that determines battery-warning thresholds and calculates remaining battery capacity.
Power management provides for:
Minimal Startup and Shutdown Delays    The system can sleep in a low power state from which it can wake up without rebooting.
Greater Overall Power Efficiency and Prolonged Battery Life    Power is only applied to devices that are being used. When a device is not being used, it can be powered down and then powered up later, on demand.
Quieter Operation    Powering down unused devices reduces noise.
Unlike previous approaches to power management, OnNow manages power for the entire system including all system devices and peripherals. To make this possible, the operating system must direct power to the computer.
With legacy power management architectures, the BIOS controls the power state of system devices. However, OnNow makes it possible for the operating system to coordinate power management activities at all levels and define the power-state transitions for the system.
Computer power management means there is control over how the computer consumes energy and integrates its components. For example, a program that is active or input from a device such as a mouse, keyboard, or joystick indicates to the power management system that the computer is in use. As a result, the power management system allocates full power to the computer. Otherwise, the power management system puts the computer into a sleep state. Another example is a fax modem, which does not need to use full power all the time. The fax modem can operate in a standby state, consuming less energy until it needs to receive an incoming fax, at which time it is given full power. This section describes how Windows 2000 Professional supports power management.

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