In the control panel. At the Start Menu search for "Control Panel", and then in the Control Panel search for "brightness" and see if you can adjust it on the screen with the meter.
In the control panel. At the Start Menu search for "Control Panel", and then in the Control Panel search for "brightness" and see if you can adjust it on the screen with the meter.
Windows doesn't know anything about your Fn key, this function is provided by a Samsung driver. Go to Samsung and look for this driver and install. It's probably named hotkey.