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Linus,
KNC A1s are never intended to be videocards, I think the fact that you have it with some video outputs may just indicate that those ones are either refurbished ones with old PCBs or they just made it out of inertia.
I am unable to find my old pictures with real Larabee which as far as I can remember could work only in text mode out-of-box, but I am pretty sure they had black shrouds. Next gen has metal shrouds and then blue ones. So, you are having almost production grade board, you can download the drivers on official Intel site, but they are for calculations only.
Here are photos of KNF E0 which was the first add in card Intel admited to be a co-processor, not a videocard They are taken in the early 2011.