Cynosa V2 backlights turn off when pressing FN key | Razer Insider
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When the FN key is pressed on the Cynosa V2 keyboard, the lights for all the buttons except F9-F12 go out.

Is it possible to prevent this?

It makes absolutely no sense whatsoever - FN+F11 and FN+F12 are used to change the light brightness ...while you can't see the lights. SMH.