HT3986 My keyboard backlight doesn't work on windows 7 Ultimate but it does on mac OS X Lion version 10.7.3. When I press the keys on keyboard to change the backlight, it just shows me a null on the light bar and doesn't let me turn on the brightness.

Are there any updates that I need for the boot camp or do I have to go to some settings.

When you say "null on the light bar" do you mean that there is an on-screen indicator that appears when you press the brightness keys, but it doesn't change?
Which Mac are you using? I have a 13" MacBook Pro (2010) and those keys seem to work fine for me. But I just installed Boot Camp, so I might be using newer drivers than you are.
Are you using Boot Camp 4? This just came out with Lion. It allows for automatic updates to the Windows drivers and support software. If you installed Boot Camp before you upgraded to Lion, then you might need to upgrade your Windows drivers to Boot Camp 4. See here: http://docs.info.apple.com/article.html?path=Mac/10.7/en/mchlp15553.html
If none of this applies to you, then I'm not sure what to do about it, other than talk to an Apple service rep.

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