Is there any additional information on this nvidia driver change? Are you still locked out of the various scaled resolutions between native 5k and the retina version of 2560X1440 with a 980 and a 5k display?
I was hoping that an nvidia web driver update for 10.10.3 would restore the ability to run the scaled modes since support was previously there for them.
On a 27" 5k my personal sweet spot is either 2880 x 1620 (scaled) or 3200 X 1800 (scaled). I have pretty good eyes but native 5k is out of the question and 2560X1600 no longer gives me enough screen real estate to be completely comfortable working.
I am still only getting the 2 choices. Anyone else with a Dell 5K that can confirm?