(In reply to ITwrx from comment #20)
> @lameventanas@gmail.com
> 
> i ran "kodi -send --action='ActivateWindow(screencalibration)'"
> 
> but it just opened up kodi in default fashion and underscan was still not
> accounted for. was "screencalibration" above just an example?
> 
> thanks

You have to run this (don't insert a space):
"kodi-send --action='ActivateWindow(screencalibration)'"

once Kodi is already running, it will trigger the screen calibration dialog,
where you can compensate for overscan/underscan by yourself (in Kodi).  You can
also find it somewhere in the Settings window.