Some control options are available for specialized cases. NVIDIA cannot test non-default behaviors and recommends strongly that these control options not be used. The GPU is already turned on only when needed. Forcing IGP would cause unacceptable performance issues (e.g., unable to play some video content) and cause confusing, inconsistent behavior for end users at different times an application is launched. Avoiding such user-visible modes is a primary advantage of Optimus over hybrid/switchable graphics.