subject: How to use PowerCfg in Windows 7 to Evaluate Power Efficiency [print this page] How to use PowerCfg in Windows 7 to Evaluate Power Efficiency
I think many laptop users have been plagued by power problems, even when using power saving mode has been set up, now look at the details on the power and use the PowerCfg command to Evaluate Power Efficiency report.
PowerCfg provides guidelines for system manufacturers to take advantage of this new PowerCfg functionality before shipping a new system model to customers. Similarly, IT professionals can use these PowerCfg enhancements to diagnose and resolve end-user problems with portable computer battery life and desktop energy efficiency.
Generate Report
You'll need to use the Elevated Command Prompt as Administrator to generate the report . Click on Start and type CMD into the search box, then right-click the command prompt icon and select Run as Administrator.
Type in the following command to generate the report on energy efficiency:
powercfg -energy
You'll see the following message in the command screen when it's finished with 60 seconds. Notice it shows the number of errors and warnings contained in the report.
The Power Efficiency Diagnostics Report is saved in HTML format in your local user drive. Now you can read through the analysis and try to determine what is causing so much power to drain. In this example in the errors section it's showing Sleep Mode is disabled and a USB device is not turning off when not in use.
Sections of Report
So what does this report even mean? Well, it's broken down into 4 sections and we'll take a look at each one. The first section of the report contains the basic system information like the system name, BIOS, manufactureretc.
The second section contains the Errors with a red background. These are problems that have a huge effect on power consumption and battery life. Problems classified as Errors can affect battery life by 15% or more.
The next section are Warnings that have a yellow background. The problems indicate a moderate effect of power consumption and battery life. They are not as critical to fix as Errors, but if you can fix them, it will help improve efficiency.
The last part of the report contains informational data with a white background, and don't indicate any energy problems. This lists the system components that were inspected for the report.
In addition to power policy configuration, PowerCfg also enables system manufacturers to inspect a Windows platform for common energy efficiency problems. Many individual energy efficiency problems can be detected, including inefficient power policy settings, USB device selective suspend issues, and platform firmware problems that relate to processor power management capabilities. This paper describes how to use PowerCfg to evaluate system energy efficiency and details the energy efficiency problems that might be detected.
Conclusion
Computer power supply problem is a big problem, we have finally resolved, but other than that,there are many things you should pay attention to, so the battery can last longer.
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