Sorry, it's already known upstream so no need to file a bug there:
http://wiki.x.org/wiki/radeonhd#head-d0cfd39d1b149a43f0c1d862f21f4b3ddcb43ae2
** Changed in: xserver-xorg-video-radeonhd (Ubuntu)
Status: New => Confirmed
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cannot adjust backlight when using radeonhd
https://bugs.launchpad.net/bugs/199389
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