Possible to adjust console HDMI without X?

I’m running Server 18.04 on an Intel NUC box and have no need for a GUI console. I don’t use it very often but the text console that I do have is displayed too wide and tall so that the edges of the display are off-screen. I’ve read a lot about how to adjust this using XRANDR mostly but that doesn’t seem to apply without X running.

Intel basically said “too bad” but we don’t support anything other than Windows 10.

I think what I need is something that will adjust the HDMI underscan … does that sound right? I don’t know much about HDMI …

Any hints would be appreciated.

Bill W