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In [[RetroArch]], there is an option for black frame insertion in the video options in the menu. This makes it draw an extra black frame for every frame and it succeeds in making the motion smooth at 120Hz. There is an option to set the vsync swap interval if you want to double frames instead. The "refresh rate" setting should be set to 60Hz (monitor refresh rate/2) for accurate dynamic rate control in these cases.
120Hz with software inserted black frames has have less latency than doing so on the display's hardware. It also has less latency vs. displaying straight 60Hz due to the decreased frame times between vsync in emulators. It also doubles the performance requirements of an emulator to maintain vsync for the same reason.
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