Don’t see the DisplayPort specs in Adrenaline but we do have a display specs section under Settings -> Display -> Display Specs at the bottom. Doesn’t say anything at all about the interface, though. Nothing wrong with DisplayPort. In fact, it has some good benefits over HDMI. They mostly reached feature parity several years ago so the 10-bit color is no longer DP exclusive but the cable itself locks in to the ports so there’s less chance of it getting loose. Also, you can daisy-chain DP cables so that you can use several monitors with only a single port. Wonderful feature as it keeps the cables neat and tidy. That’s how I had things set up. Only issue is that TVs don’t support DP cables.
Does hardware HDR cause issues, then? I know Windows has had it in the settings menu for years but I never had a screen that supported it