display brighness on battery

Marcus Moeller <[email protected]> Thu, 18 Aug 2011 16:04:23 +0200
Newsgroups gmane.comp.window-managers.icewm.user
Message-ID <[email protected]>
Hi all.

I wonder if there is a way to reduce the display brightness 
automatically if my laptop is on battery?

Greets
Marcus

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