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I use
xrandr –output–-output LVDS1 –set–-set BACKLIGHT 5
Or values other than "5".
See http://linux-software-news-tutorials.blogspot.co.uk/2011/07/how-to-change-screen-brightness-of.html
xrandr –output LVDS1 –set BACKLIGHT 5
xrandr –-output LVDS1 –-set BACKLIGHT 5
