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hp probook 450 g8 keyboard light

I DIsbaled the backlight to the keyboard about a year ago, But cant find how to ebable it.

I had some eye surgery and want to ebable it again, but cant remember how I did it.

The f9 key is blank,does not have that 3 bar key for backlight however I remember disabling the backlights becayse they were too bright.

Now I want to enable it again but I have searched and tried everything. 

Tried f5 and f4 and f3 

I have looked in BIOs , cant find anything there, unless I missed it. 

I just dont know anymore. 

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