Make backlight buttons work in Debian Wheezy on a HP EliteBook 8460p

The backlight hardware buttons weren’t working on my HP EliteBook 8460w so I was using sudo xrandr –output LVDS –brightness 1 and sudo xrandr –output LVDS –brightness .5 That sort of worked but it only multiplied the gamma values. randr is a software solution – it doesn’t really change the …

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