Brightness changes on display

Hi
I've got a Macbook pro 13 inch 10.7.5 from mid 2011. I've noticed over the past week that my brightness setting will randomly automatically go down a few levels even when I'm plugged in. I've got my sleep settings set for 1 hour, but this will happen only minutes after setting my brightness level back to my perferred setting. As far as I can tell in the energy saver options I've got them off, and don't have screen saver on...so not sure why this is happening. Any ideas?
Thanks

It may be happening because your computer sets up the brightness automatically. To do it, open System Preferences > Displays, and untick "Automatically adjust brightness"

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