Windows Vista includes a command line tool, Powercfg.Exe, that you can use to configure power management settings.
Windows 7 introduces a new switch, -energy which…
- provides a comprehensive report of those settings;
- offers diagnostics that can indicate which applications or devices might be causing power management issues (such as a USB driver not entering suspend)
- shows what power management settings you can configure differently for better results.
At an elevated command prompt, simply enter:
POWERCFG –ENERGY –OUTPUT <path\filename>
The tool will observe your computer for 60 seconds, and then create a file called ENERGY-REPORT.HTML in the path you specified. Simply double-click on this file to see what’s going on.