I myself had issues with the demo/benchmark. Tried re installing driver, etc... Found the issue for me was running two monitors. R9 285, port 1 HDMI, secondary display LG LCD monitor @ 1280x1024 R9 285, port 2 DVI, Primary display Samsung 245BW LCD monitor @ 1920 x 1200 Primary display would white screen under Mantle when launching Star Swarm. Disabled secondary display (LG monitor) and launched the dem
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