Great, just few days of using it and today I turned it on and I can barely see anything on the screen. Rebooted MBP, did reset the display (although I changed nothing from default settings apart from choosing TB port)... Any ideas before RMA? Brightness/contrast are set to 75%.
EDIT: resolved as described on Dell website
here. I had to unplug the monitor from the AC and plug it back... Dell says it should not happen from M2T103 onwards but I am on the M2T103 and it did happen.
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Interesting...
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Apparently mine is U3224KBA I did not know it makes a difference. There doesn't seem to be firmware update beyond M2T105 for this model.