[nwp90]

I've got two U2713HM. One at work, connected to a Mac Mini (HD4000) via displayport. The other at home using HDMI (so not up to full native res). The only problems have been caused by the Mac Mini (and have happened no matter what the connection being used was). We're also using it to connect a few other large monitors to various Macs.

I don't think your problem is anything to do with displayport. In fact, I'd recommend using it to anyone connecting a large non-Apple monitor to anything with a miniDP or DP connector to drive it. Shame that miniDP to DP cables are so hard to get hold of (down here in NZ, at least).

Edit: I'm running Linux, most of the others are on OS X. As I said, only problems have been the Mac Mini's fault (happens with all connectors and OSes).