Windows Scaling- Non NVIDIA GPUs (TAGUS/MAYON/AMBA...)

In some situations depending on the display attached you can find that the Desktop mode and Active signal mode differ, this is a windows/GPU feature we have no direct control over. It often appears looking like your output is scaled , in the instance below you would get the top left 1920x1080 pixels over the whole 3840x2160 you are sending. In the case of SDI output modules you will get no output.

To check to see if your display is doing this in windows display settings select the display you want to check then scroll down to the Advanced Display menu and select it

In there you will see if the Desktop mode and Active signal mode are different. If you select the Display adapter properties for Display (4 in this instance)

You will then get a pop-up that looks like the below

Select the List All Modes button and you'll get a list of all the resolutions and refresh rates available

Remember the one that is highlighted, then change the value to a one, select Ok, then Apply and Keep Changes, then revert back to what you actually want, you should then find the Desktop mode and Active signal Mode match