Question. If you select 1920x1200, is it actually running at 2880 still? just with the icons and whatnot running at the size they would be if it was actually at that resolution? OR are you actually running it at true 1920x1200 resulting in slightly skewed looking picture as it's not at native?
If the sooner is true, I wish all laptops performed like this. I am assuming however that it's the latter thats the case.
In "Looks like 1920x1200" mode it runs at 3840x2400 (double 1920x1200 in both directions). This lets applications use the double-resolution images, buttons, etc.
The final result is scaled down to 2880x1800 to fit the screen pixels.