After upgrading to Mavericks, F14/F15 brightness adjustments don't work

After upgrading to Mavericks, F14/F15 brightness adjustments don't work.  The screen appears to be "locked" at the dimmest brightness level.  How do I adjust the brightness?

I am home now and I just confirmed that I have a brightness control slide in my Sys Pre---> Display. However, this for my Apple Cinema display. When I was using another name brand, this wasn't available to me. Nor could I use F1 and F2.
I also went to Sys Pre---> Keyboard---> Shortcuts---> Display---> Changed those values to F5 and F6, since they were free for me. And they were able to change the brightness for me. Went to test them, and I was just given that error chim and nothing on the display changed.
So I went on down the list... Accessibility---> checked Contrast and changed those to F5 and F6. Ahhh, now I can change that. Now I know that I can use the F5 and F6 for something.
I know that you are talking about brightness, but double check the Contrast settings to see if you were mistaking the two. After years of setting my TV with Video Essentials, I still get the two mixed up from time to time.
KOT

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