I updated, but now my keyboard backlight will not work. Any suggestions?

I recently updated my MacBook Pro to OSX 10.8.4, but now my keyboard backlight does not work and there is nothing I can find in the Keyboard section of preferences to turn it back on. Anyone else had this problem?

One of these steps should help.
1. Restart.
2. Press F6 key couple of times.
3. System Preferences > Keyboard > Keyboard
                       Uncheck the box next to "Adjust keyboard brightness in low light"
4. Reset SMC
    http://support.apple.com/kb/HT3964
   Choose the method for:
   "Resetting SMC on portables with a battery you should not remove on your own".

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