It is a Samsung UE65NU8000.
Screen is set to 16:9
Screen adaptation is set to non (can also be on or auto). text says “increase image to fill screen”
with perfectly calibrated screen I meant I get the calibration image and the top left and bottom ricght alignment marker are in a perfect spot (I always hide 1 pixel of the image you are moving in the corner: 1 pixel up/down and left right
Apologies if this is blindingly obvious but one thing it took me a little while to realise is that calibration settings are stored per resolution and per refresh rate; so 1080p/24, 1080p/50 and 1080p/60 all have different settings. Resetting to default for one resolution or refresh rate may not affect others.
that sounds like it’s almost certainly the wrong setting.
Thanks. This setting is set to "none (or off) so tv is not doing that. TV Interface is in Dutch, switched to English now:
Opened guisettings and found two resolutions I used that had overlay settings other than 0,0. Reset them all to 0,0 and changed the gui to 1920x1080 for all. saved and rebooted. Even went back to check the settings are still ok (and not overwritten on reboot or something)
As you can see in the picture above part of the kodi gui is now offscreen (icons for movies etc are just a bit cut off). TV scaling off and guisettings all reset. Weird. Can’t easily try the other HDMI ports.
It looks like regardless of settings, your TV has a bit of overscan. You can test this by going in to the Kodi settings for adjusting the screen and seeing if the markers at the top left and lower right are visible. Don’t change anything on this screen (just hit “Esc” or “Back”), but use it to see.
If the markers are offscreen on both sides, your TV has built-in overscan in the mode you have selected. You might need to reach out to other Samsung owners (maybe in a forum somewhere?) to see if this can be disabled using the TV settings. If not, you will have to then use the Kodi adjustments to fix it.
Also samsung is a bit cryptic on this setting. No definition of what ON, OFF or AUTO do but they suggest it must be used for HDMI signals. I guess ON at least makes that stable (fixed settings), where auto might have it change.