Keyboard backlight on rMBP not automatically illuminating, what's wrong?

Setting is on, used to work, but no longer does
How can I fix this?
Ignore- fixed
turned setting off, rebooted
turned it on , rebooted
fixed.

I'd try resetting the SMC as shown here:
http://support.apple.com/kb/ht3964

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Keyboard backlight on rMBP not automatically illuminating, what's wrong?

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