How do I allow full brightness control on Unity?

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http://askubuntu.com – When I use the brightness changing buttons Unity changes the brightness by two levels each time to create a nice effect. However, I only have about 10 different brightness settings and so this effect has caused a reduction in brightness settings to 5. I change my brightness regularly to suit the lighting in the room I'm in, but am unable to do this so effectively now that the number of levels has been reduced. Is there any way of turning off this brightness effect and controlling my brightness setting more sensitively? Thank you for your time. EDIT: It may not be 2 levels it changes at a (HowTos)