I already answered in the PM, but for everyone else's benefit...
Actually, before that, please don't send me a PM in addition to making a forum post. It's kind of like sending the same email to all of my email addresses, which is annoying.
Sorry, but DisplayPort simply isn't being worked on right now. The main reason is that (almost?) all monitors have DVI/HDMI as well, so it's not something that's essential. There are far higher priority things that need doing. Besides, I don't have a DisplayPort monitor, so I couldn't even test it if I were working on it.Any news on DisplayPort support ?
Short answer, no.I'm asking this because DVI for my Samsung 4K-monitor, but it only does 30Hz @3840x2160 or does a DVI Duallink cable does 60Hz (?) anyone ?
AFAIK, 3840x2160@30Hz has a 297 MHz pixel clock, so 60Hz needs a 594 MHz pixel clock. HDMI v1.2 and below can handle up to 165 MHz per channel, or 330 MHz.
Here's where things get complicated. Southern Islands GPUs have HDMI 1.3, which can handle up to 340 MHz per channel (680 MHz dual-link). It should work with those cards.
NOTE: You'll still need to use dual-link for anything over 165 MHz even with HDMI 1.3 hardware, because the graphics driver currently has no means to detect the presence of an HDMI 1.3 monitor.