Haiku

I've tested on an HD7700, but not the R9 290 or HD7990. If you could test them I'd appreciate it! Let me know what outputs the card has, what resolution you can test with. IIRC the HD7990 should be resolution capped and not hit 4K (but should gracefully fallback to a lower resolution, not produce a corrupted output), I think the R9 can get to 4K via DP but not HDMI. If you see weird artifacts, corruption, etc try to grab a photo and the syslog. .hkpg is on github: https://github.com/KevinAdams05/RadeonHDunofficial