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I just installed Ubuntu 14.04 and removed Unity and installed MATE. Now, the Fn keys on my keyboard can't adjust brightness. Here's the thing that makes it extra extr confusing: my brightness worked under Unity. Even more confusing, there is a bug in MATE that makes a small white square appear. I don't see it. It's like when I press my brightness keys, nothing happens like I'm not even pressing them. This worked under Unity.

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Also, I'm not using a version of Ubuntu MATE or anything, I installed the packages myself from official PPAs and the Ubuntu repos. – John Scott Oct 14 '14 at 20:18
    
Is there a package that is responsible for the brightness? maybe I need to install it. – John Scott Oct 14 '14 at 22:05
    
Okay. If no one wants to give me an answer, at least tell me of a program I can use to adjust my brightness. A command would do nicely. – John Scott Oct 15 '14 at 0:16
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The problem is MATE does not come with a program to manage brightness. In a terminal, type sudo apt-get install mate-power-manager and let it install. Restart, and brightness should now work because there is a program to handle brightness key presses.

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