Backlighting on the keyboard has suddenly stopped.  Help?

I have a MacBook Pro (Retina 13", Core i5 2.8 ghz, OSX Yosemite 10.10).  The backlighting on my keyboard suddenly stopped.  I've tried re-booting and making changes in settings, but that has not fixed the problem.  Anyone else run into this?

Having the same issue, would love to know if you were able to resolve it. I'm also not able to use Tab, Return, and F12 for some reason.

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