Is it possible to programmatically delay a monitor's vertical retrace?

Talk about NVIDIA G-SYNC, a variable refresh rate (VRR) technology. G-SYNC eliminates stutters, tearing, and reduces input lag. List of G-SYNC Monitors.
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albrechtmyers
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Joined: 12 Feb 2020, 01:47

Is it possible to programmatically delay a monitor's vertical retrace?

Post by albrechtmyers » 12 Feb 2020, 04:40

Given FreeSync and GSync it is now possible that graphics card and monitor work together to support variable frame rates and control when a monitor refreshes.

My question is if with a fixed framerate monitor there is any way to do something similar in a very limited way. I would like to cause a slight delay of the vertical retrace of a monitor (via HDMI / DVI) to come in sync with an external image source.

Is this possible based on TMDS based video connections? Is this something any graphics cards exposes?
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