Auto display resolution change to use a better TV 4K upscaler

[relkai]

Having the GUI set to a 4k resolution doesn’t make sense, because it’s just an upscaled 1080p GUI.
Just set your GUI resolution to 1080p like recommended in this topic:

Recommended Kodi Settings

Below are the video settings which we recommend for Kodi v18 Leia, by default our builds will use these settings unless you have changed them. Settings > Player > Videos Adjust display refresh rate => On start / stop Sync playback to display => disabled Settings > System > Display Whitelist => de-select all options Resolution => 1920x1080p Notes: Whitelist: When this feature was first introduced into Kodi it was very problematic for Amlogic devices and would cause playback issues if …

Using these settings, your TV automatically switches to a 4k resolution when a 4k movie is being played back and uses 1080p for all movies <=1080p.