http://www.digital-loggers.com/lpc.html
This is an easy way to control that from your browser.
Source code:
https://github.com/vapier/chrome-ext-web-power-switch
http://git.wh0rd.org/chrome-ext/web-power-switch.git
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Web Power Switch Manager is a free Productivity Extension for Chrome. You could download the latest version crx file or old version crx files and install it.