The DevCon utility is a command-line utility that acts as an alternative to Device Manager. Using DevCon, you can enable, disable, restart, update, remove, and query individual devices or groups of devices.
Download the “Windows Driver Kit (WDK) 7.1.0 from Microsoft: http://www.microsoft.com/download/en/details.aspx?id=11800
Extract the ISO to a temp directory with WinRAR, Uniectractor
Extract the install file “WDK\setuptools_x64fre.msi” to a temp directory, where you will find “WinDDK\7600.16385.win7_wdk.100208-1538\tools\devcon\amd64\devcon.exe”
Note: devcon MUST be run from an administrator cmd win.
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, to provide a comprehensive report of those settings. It also offers diagnostics that can indicate which applications or devices might be causing power management issues (such as a USB driver not entering suspend) and 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.