Hmm using the DP I can't get the 4k monitor to start up with a picture. In SwitchRes, I show two 30hz 4K options. It defaults to the top one. If I select the top one, I get no picture on the monitor. If I select the bottom I get a picture, but it won't use that by default. Any pointers anyone?
[doublepost=1534203185][/doublepost]Ok, I found out what the difference between those two is, OSX is treating the second that works as a "scaled" resolution. If I pick "default for monitor" I lose my picture. If I pick that resolution under scaled, it works fine, even though it's the same resolution?
[doublepost=1534203621][/doublepost]OK, seems to be a Dell problem actually. I went into the OSD menu and disabled DisplayPort 1.2 under Display Settings and now it works. Wonder if this Del P2815Q has some DP1.2 issues....
[doublepost=1534204016][/doublepost]lol, digging around on the internet, seems this monitor is rubbish...glad I didn't pay for it. lol.