Enable Freesync on BENQ G2220HD DVI-D

[denexter3]

Freesync option is greyed out in AMD Radeon panel.

So I already did some configuration in CRU:


It should be noted that CEA-861 wasn't present in extension blocks, I had to add it manually, just like all of its data blocks.

I'm using HDMI to DVI-D adapter, which makes it possible to use 85 hz without pixel clock patch, but I installed the patch anyways.
I also edited my Display Properties, increased the limit, included everything and changed all the names and ID's to random gibberish.

EDIT: Without HDMI to DVI-D adapter, changing all monitor profiles (not just the active), and replugging my monitor afterwards I was able to enable Freesync on my monitor.
With one flaw.
It was completely black, no image whatsoever.
I had to plug in the adapter to get my display to work, but that disables Freesync.
AMD left a notification that Freesync worked, that's how I know it (kinda) worked.

[Chief Blur Buster]

A few people were able to get FreeSync working on DVI-D, but it's very hit and miss. Not all adaptors work and, in theory can force FreeSync on a DVI-D to DVI-D since FreeSync is port-agnostic (FreeSync works on CRTs too!). For those familiar with blanking intervals -- VRR video signal topology is just simply a dynamic continuously-changing vertical total (resizeable VBI between refresh cycles to vary the time interval between the starts of refresh cycle scanouts).

The most common weak links preventing FreeSync from working is:
- Missing FreeSync extension block data (fixable via ToastyX)
- Display never designed to tolerate varying refresh rates
- Drivers having an arbitrary prevention on a non-HDMI non-DP port despite an overridden EDID
- Adaptors that fail to pass through a varying refresh rate signal

For the analog case, one needs to output HDMI and use HDMI-to-VGA adaptors that are 1:1 dotclock.

It takes lots of trial and error (cherrypicked VGA and DVI displays, combined with cherrypicked adaptors) to find a combination with successfully working uncertified and hitherto untested VRR.

Interesting to note, among the oldest known displays that "accidentally" works with FreeSync are roughly 1980s or 1990s "MultiSync" CRTs -- long before "variable refresh rate synchronized to frame rates" was conceptualized. Some CRT's tolerate a variable blanking interval by accidental design of robustness (of their multisync circuitry).