I tried what you said, but I don't see the "RtkGUI" listed under my notifications. I did upgrade to 8.1 on my Samsung, not sure if that would of changed this screen or not.
I turned off this switch before going from 8 to 8.1 (via store). And the switch is still there in 8.1 and still off. My device manager lists driver version 6.0.1.6865 on Samsung model NP680Z5E-X01US.
Here is a screen shot of the notification switch...
Good luck.