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hp 975 dual mode

Hello,

 

I recently acquired HP 975 keyboard and I struggle with the backlight. When turned on it works fine and adapts to the environment light. However when I lock the function button the backlight works only when the dedicated button is pressed above the numpad and it works for a very limited time, about 10 seconds. Then even when used the keyboard remains dark. 

Therefore I have two questions:

1) How to enable adjustable backlight when function button is locked?

2) How to enable backlight permamently?

 

Thank you,

Martin

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