Originally Posted by AaronP
I should note that that bug covers the Sony Vaio VGN-FZ38M only. Every laptop vendor has its own different, incompatible way of controlling the backlight brightness which is why it's so difficult for a unified driver to make it work all of the time and why NVIDIA doesn't even try to provide notebook drivers for Windows.
I'd like to precise that we don't really need NVidia to actually make our Fn keys work, "just" the backlight management which I believe is supplied by the NVidia chipset. My Fn keys already send a scancode to the acpi subsystem, so I can create an event and map them to the correct action, it's enough if NVidia give us BrightnessUp.sh and BrightnessDown.sh. I understand that the controller for the Fn keys is vendor specific, but shouldn't the brightness be controlled by the NVidia chip? Once we have the action we can take care of the rest. I mean my suspend key also did not work out of the box, but the suspend action was available to the system.