Windows 7 Power Management White Paper - Nine Ways to Save Battery Power

Soft recently announced a 14-page white paper titled "Windows 7 Power Management," which describes how power management technology in Windows 7 reduces power consumption. If you want to know how Windows 7 saves power, this white paper will give you the answer. If you just want to take a quick and easy look, the following will tell you the main means of saving Windows 7 power.

1. Energy consumption of idle resources

When a computer starts up, it will not be in full load operation, so there will be a lot of idle time, so the power consumption in idle time It has become an important technology in power management. In Windows 7, the power consumption during idle time is effectively improved. When a certain hardware does not work for a certain period of time, it will enter a low power state and achieve power saving. This technology is used in the CPU, hard disk, memory, and network sections. For example, a CPU with a full power consumption of 35w consumes almost zero power when idle, and this alone can save a lot of power.

2. Start the service by triggering

Usually the system service will start together when the system starts, and then stay in the background and wait for the call. In Windows 7, some system services are only started when triggered by some events, such as inserting a device or changing the IP. This reduces the number of long-running services in the background process.

3. Enhanced Processor Power Management

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

4. Adaptive display brightness adjustment

Microsoft said that the display will automatically turn off if there is no operation for 10-15 minutes. However, there will be more short-term no-operations in actual use, and in order to save energy, the technology will reduce the brightness of the display. In addition, it can use some sensing devices to adjust the brightness of the display according to the brightness of the surrounding environment.

5. Low-Power Audio

Windows 7 will support Intel's low-power HD audio specification, which allows the codec to enter a very low power state. Windows 7 also supports selective suspend technology to turn off devices that are idle, such as USB devices such as microphones and cameras.

6. Timer Integration

At present, the processor achieves energy saving by utilizing the gap free time of the processing instruction, but most energy-saving technologies require a certain length of idle time to obtain energy-saving effects. This technology increases the idle time of the processor by allowing the Windows kernel to terminate at the same time and concentrate on a plurality of timers that are more dispersed.

In addition, Windows 7 reduces the frequency of non-critical daemons when the notebook is using a battery.

7. Bluetooth Device Power Consumption Improvements

When Windows 7 detects that Bluetooth devices are in a low-power state, they are temporarily turned off, which is “selectively suspended”.

8. Network device power consumption improvement

The compatibility of the wireless network controller low power mode in Windows 7 has been enhanced, only when the wireless AP device supports the low power mode. It will be enabled. Vista can cause a sudden interruption in the wireless network connection because it cannot detect in advance whether it supports low-power mode. Windows 7 will prevent this from happening and will first detect if the wireless AP supports this mode before entering low power mode.

9. Optimization of Typical Applications

In addition to the improvements listed above, Microsoft has turned its attention to specific applications, including search, browsing without networking and mini-games. The following is part of the optimization scheme for DVD playback:

· Keep the CPU in low power mode without affecting playback performance.

Improve the desktop window manager by changing the architecture and GPU Power Consumption

Intelligent Data Cache Reduces Optical Drive Speed ​​

These are the 9 important improvements in power management for Windows 7, which saves more power than previous systems. In addition to these improvements, IT professionals can use power management diagnostics to find problems that can affect power efficiency.