Brightness adjustment does not work on my NX9420. When the ambient light sensor is enabled and light...
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Brightness adjustment does not work on my NX9420. When the ambient light sensor is enabled and light is present the screen does brighten indicting that the back light works it is just that the fn f9 and fn f10 does not work to manually increase or decrease the brightness. I have reinstalled the HP quick launch buttons drivers and this did not help. I did a keyboard check and all of the keys responded. It seems to be hardware related because I have another laptop of the same model and I swapped the hard drives to see if this was software / driver related and the problem remained with the same computer indicating that it is not software related. Any suggestions?