DP1 works fine with me on my r9 290, with flickering and animation lag. My Mac showed my r9 290 as AMD radeon 8XXX with 4 GB of ram. DP2 is not working at all, any ways to fix the flickering and animation lags?
Yeah for the flickering just unplug the video cable from your card wait like 2 seconds and plug it back in
kext edits should work in dp2 they do for me just download mine and put them in your kext folder