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I downloaded Windows 8 and the keyboard lighting doesn't work. How do I adjust the keyboard lighting?
Download and install if there is any update available on the support page regarding your issue by using the exact model # of your computer and selecting the Windows 8 Operating System here: http://esupport.sony.com/US/p/select-system.pl?DIRECTOR=DRIVER
You can get back with the exact model # of your computer.
Note: If my post answers your question, please mark it as an "Accepted Solution."
Here's the first place I would check: Open the "Vaio Control Center" app, go to "Mouse & Keyboard" and check your settings on the two "keyboard backlight" options there.