[ktide1]

just tried that, it didnt work at all, 1080 video still played 4x size with scaling set to 100 percent.

Try this: Exit Kodi and go to your desktop. On your Kodi shortcut, right click it and right click again on "Kodi" when the context menu pops up (or alternately, just find Kodi in your apps menu and right click it). Click on properties, go to compatibility tab and make sure "Disable display scaling on high DPI settings" is checked. Restart Kodi and test. Not sure how it will work at 100% scaling, but usually fixes a lot of these types of problems at higher scaling factors, so worth a try.