Microsoft recently published a report entitled “win7 Power Management” of the 14 white paper describes Windows 7’s power management technology to reduce power consumption. Windows 7 if you want to know how the power of the white paper will give you the answer. If you only want a simple quick look at, the following will tell you the main means of energy-saving Windows 7.

1. Free energy resources

When a computer starts, not always running at full load, so there will be a lot of idle time, idle time, power consumption has become an important power management technology. In win7, the idle power consumption when the effective improvement of the hardware when a certain period of time does not work will enter a low power state has to save battery power. Including the CPU, hard drive, memory and network elements have adopted this technology. For example, a full power run power 35w of the CPU power consumption at idle is almost 0, only this one will be able to save power.

2. Through the trigger to start the service

System services are typically a time when the system starts with the start, and then resides in the background waiting for calls. In Windows 7, the part of the system service is only triggered by some event will start, such as inserting a device or change the IP. This reduces the long-running background process in the number of services.

3. Enhanced processor power management

win7 in integrating the latest power management technology that allows Windows 7 based on the current load conditions and performance requirements to dynamically adjust CPU performance.

4. Adaptive display brightness adjustment

Microsoft said, usually 10-15 minutes, if no operation, the monitor will automatically shut down. However, in practical use there will be more short-term non-operating condition, in order to better energy efficiency, the technology will reduce the display’s brightness. In addition, it could use some sensing devices to adjust the brightness according to ambient brightness display.

5. Low-power audio

win7 will support Intel’s low power HD audio specification, it allows codec into low power state. win7 also supports selective suspend technology to shut down idle equipment, such as microphones and cameras such USB devices.

6. Timer integrated

The current processor instruction address space through the use of free time to save energy, but most of the energy-saving technologies need a certain length of time to get free energy saving effect. The adoption of this technology for Windows kernel at the same time, the original end and focus more dispersed multiple timers, disposed of in a short time, thus increasing the processor’s idle time.

In addition, when the laptop in case of Laptop battery, win7 non-critical background processes will reduce the frequency of activities.

7. Bluetooth devices to improve power Laptop batteries

When win7 detected Bluetooth devices in a low-power state, they will be temporarily closed, or “selective suspend.”

8. Network equipment to improve laptop battery

win7 the radio network controller for low-power mode compatibility has been enhanced, the wireless AP devices support only low-power mode is enabled only when the situation. Vista because it can not detect in advance whether to support low-power mode, it can cause sudden interruption of the wireless network connection. win7 will prevent that from happening, before entering the low power mode will first test whether to support the model of wireless AP.

9. Typical applications of the optimization program

In addition to the above listed improvements, Microsoft also turned to some specific applications, including search, browsing and small game without networking. The following is optimized DVD playback program part of the occasion:

Without affecting the playback performance of the premise of maintaining low power mode to CPU

By changing the structure to improve the desktop window manager and GPU power consumption

Intelligent data caching can reduce the drive speed

The above is win7 9 in the power management important improvements, compared to the previous system can save more energy. In addition to these improvements, IT professionals also diagnosed with laptop battery shop power management that may affect the power efficiency to find the problem.

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