New answers tagged resolution
Apple will not show you the real panel resolution, only the scaled resolutions. http://www.everymac.com/systems/apple/macbook_pro/macbook-pro-retina-display-faq/macbook-pro-retina-display-hack-to-run-native-resolution.html Try this.
Say you have you're screen set to standard (using 15" as an example here), then "it looks like" 1440x900 but it is really 2880 x 1800. Making this example easy, say the app runs in fullscreen, then it would usually load with 2880x1800. If you check the "Open in Low Resolution" it will load in 1440x900, thus being less sharp but in some cases better ...
I bought one (the Dell P2415Q) so can offer the results... Scaled options are: 1504x846, 1920x1080, 2304x1296, 2560x1440 and 3008x1692 That is to say, the macbook always outputs 3840x2160, 60Hz as far as the monitor is concerned. It just "looks like" those resolutions in terms of real-estate. 1920x1080 is the default, and other scaled resolutions are ...
I had exactly the same problem, with the same monitor, Dell U2713 / U2713H / U2713HM / U2713HMt. I had two of them plugged in to my late-2014 Retina Macbook Pro 15" and only one was experiencing the problem. I tried 100s of different solutions (I can say for sure it's definitely not the cable!) and nothing worked. Just like you, I could get landscape ...
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