keyboard - I cannot adjust the brightness on Lubuntu 14.04 - Ask Ubuntu


i using samsung np-x420 lubuntu 14.04. screen bright irritates eyes. when press brightness adjustment keys on keyboard (fn+down arrow), can see window appears on top right corner, showing changing brightness, nothing happens. bar moving left , right brightness remains harsh.

is there way adjust brightness? need install drivers? if yes, please tell me ones. not familiar computer stuff.

thanks in advance!


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