Re: 2560x1440 not working..
Thanks, U2711 is correct. We bought a whole bunch of them, including PCs with two DP connectors to drive them. Hope we don't run into problems with this DP issue..
For mDP->DVI (I thought -d is dual, I stand corrected..) I tried a 25 Euro adapter from HAMA. It advertises itself as "dual-link DVI-I" but only reaches 1600-something.
This is ****ed up...I'll wait and see if the DP-Adapter works, otherwise I have to buy the ugly and far too expensive dual-link DVI adapter from Apple..
(And yes, the actual DVI cable is also advertised as dual-link DVI and has the required additional pins..)