Xbacklight is used to adjust the backlight brightness where supported. 
It uses the RandR extension to find all outputs on the X server
supporting backlight brightness control and changes them all in the
same way.

All questions regarding this software should be directed at the
Xorg mailing list:

        http://lists.freedesktop.org/mailman/listinfo/xorg

Please submit bug reports to the Xorg bugzilla:

        https://bugs.freedesktop.org/enter_bug.cgi?product=xorg

The master development code repository can be found at:

        git://anongit.freedesktop.org/git/xorg/app/xbacklight

        http://cgit.freedesktop.org/xorg/app/xbacklight

For patch submission instructions, see:

	http://www.x.org/wiki/Development/Documentation/SubmittingPatches

For more information on the git code manager, see:

        http://wiki.x.org/wiki/GitPage