Driver-level downscaling (Nvidia DSR/DL-DSR) does not work properly.

[J20Stronk]

Nvidia DSR and DL-DSR (most likely AMD's alternative as well) do not appear to work with DCS.

I'm trying to downscale 4K to 1440p for a better image with lower performance hit than the in-game SSAA with DL-DSR, but DCS doesn't seem to want to render at higher resolutions than what the display is set to, even in exclusive fullscreen.

Other games, both new and old ones, downscale properly so this is purely a DCS thing.

I did manage to workaround this by setting my desktop resolution to 4K through either Windows Display Settings or Nvidia's CP. DCS then properly rendered at 4K and downscaled to 1440p. Still, I'd like to keep my display resolution native 1440p and have downscaling work properly with DCS like with other games.

[blaster182]

I'm successfully running DCS with downscaling. I've set the DLDSR factor 2.25 set in NVCP: Internal game resolution is 2880x1620 pixels and output is 1920x1080 pixels. My Windows desktop resolution is the original 1920x1080 px. This has enabled me to switch from MSAAx2 and SSAAx1.5 to MSAAx4 only and improve the frame rate.

[Loukuins]

You need to use Flip mode = false workaround to have Exclusive Fullscreen since ED removed it in 2.7