I’m not sure. I don’t know how or when DSC gets used. My new monitor is a 4K 144Hz display connected over DisplayPort and my GPU is a Radeon RX 7800XT. I don’t think DSC is being used in this setup but I don’t know for sure. I also used this display with an Arc A770 and GNOME VRR worked just fine there too, though I had to comment out a line in a udev rule that excluded VRR support on Intel GPUs for some reason.