Mac air keyboard doesn't light up for login

After Yosemite install, the keyboard on my Mac Air does not light up until after I login.

Pushkin,
I found that if I turn on FileVault my keyboard backlight doesn't come on at initial Login screen from boot. Nor can I adjust the brightness of my screen or keyboard backlit. The moment I turn off FileVault I can then adjust those things and everything works fine.
I say initial because if I log out of my user and am taken to the login screen I can adjust both keyboard and screen backlights.
You can see if you have FileVault turned on by going to System Preferences -> Security & Privacy -> FileVault (Tab)
Also I think that its important that we let Apple know this is going on. If you feel up to it I would send them feedback. I mean if you would like to that is. https://www.apple.com/feedback/macosx.html
Hope that helps,
Weston
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Lost keyboard lights on login screen

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Hello, I have a MacBook Pro with retina display (late 2013), and since I installed Yosemite my keyboard when I'm in the log-in screen stays off.
Also pressing the keys to enhance lighting nothing happens ...
anyone can help me to bring back my keyboard light even when the screen log in?
thanks

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After reviewing your post, I have located an article that can help with system issues. You may want to consider a PRAM reset which may address the keyboard lighting issue you've described:
OS X Yosemite: Reset your computer’s PRAM
If your Mac doesn’t seem to be remembering your speaker volume, display resolution, or the disk it should be using during startup, you may need to reset your computer’s PRAM.
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Continue holding the keys down until your Mac restarts, and you hear the startup sound for the second time.
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Cheers,
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Restart.
http://support.apple.com/kb/PH10680
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Reset SMC. http://support.apple.com/kb/HT3964
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HP ENVY TS 15 is a series of many models/products, what is yours ? Please use instructions from the following link to find out:
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Mac air keyboard doesn't light up for login

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