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What should I do in order to make the display brightness settings changable? View 3 Replies I've recently bought an HP Probook430 and installed Windows 7 Ultimate 32bit and I don't seem to be able to change the display brightness, using the fn button+f9/f10 (although volume settings are changed in the same method smoothly).Īlthough the brightness settings don't seem to change, this bar does appear when pressing fn+f9/f10.