A dvi-d dual link though? There is a difference, as I'm sure you are aware.
I have the same screen in front of me at work, we 'found' it

A few of the others messed with displayport to dvi, hdmi to dvi adaptors etc etc trying to get it to work on their laptops.
Once they were fed up of being unable to get anything above the resolution you describe, I purchased a usb powered dell bizlink displayport to duallink dvi adaptor for £25 and a duallink dvi cable from amazon for £5.
Plugged it all in thinking i was the dogs-pods to get the correct resolution but horrible ghosting screen

Just before it went in the bin I decided to try another of the monitors 3 dvi ports and to my great amazement the 2nd one worked!!
Hurray, I now look down on the peasants at work with their 24" screens!