ilkiii, i'm glad you have your graphics card recognized but now that way it is now does not have 100% support. The video worked but with generic framebuffer, so you see the HD 5000 system information. My graphics card was exactly the same way. I wonder if you are using DSDT, Chameleon injection or Clover, or something. I know that the card is recognized natively, without the need for any injection, but, as I said, this is not 100%. The frame buffer most suitable for our graphics cards is the Baboon. With it you will have support for all connectors, slightly better performance and lower temperatures.
Take a good read to this post to know what are the sense ids for your graphics card. I have edited the kext AMD5000controler and everything is ok for me now. You can also keep untouched kext and inject the correct values for the connectors through the settings of Clover.