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It's not that simple. Software trickery can't add VESA Adaptive Sync to a monitor which doesn't have it.
Apparently it can, using "blanking":
Here's someone who could make freesync work on a qnix qx2710 single dvi input.
But had to trick the driver into thinking it was hdmi, doing so the dual-link dvi could only work in single-link dvi.
All this sounds crazy but look at the second youtube video of that post, it just work:
(video filmed at 240fps with 8x reduced speed)
On those dvi-no-scaler-display, the pannel is like directly connected to the graphic card.
And here's an explanation of how it works by the creator of CRU ToastyX:
"FreeSync works by varying the vertical blanking interval. ALL monitors support vertical blanking. It's part of the video signal. It's how the monitor knows where one frame ends and the next frame begins. The only question is whether the monitor can handle variable vertical blanking and longer blanking intervals. CRT monitors are basically controlled directly by the video signal, so this is more likely to work with a CRT. LCD monitors without scalers and laptop screens might also work. AMD themselves even demonstrated it working on existing hardware.
The problem is most LCD monitors on the market have scalers. LCD monitors with scalers are less likely to work without firmware changes because the scalers are usually designed to handle a limited range of refresh rates and timing parameters. The fact that some monitors are blacking out shows that it's actually doing something to the video signal and not just a driver toggle."