AMD and EA pushed the updates enabling Mantle API support on Battlefield 4 a few days ago after several long delays but it seems like they havenít got it right as yet. As ExtremeTech points out, Mantle update carries a small bug which causes greying and dullness in some graphic elements in the game. This bug mainly effects the sky boxes, long distance mountains and other background elements.
ExteremTech made use of the Golmud Highway map to demonstrate the issue. As you can see in the screenshot above, the faraway elements and especially the sky is a bit greyed out and slightly less saturated as compared to the other screenshot taken with DirectX enabled. This doesnít seem like a major glitch, just a post processing adjustment.
EA has already acknowledged the issue accepting that its a bug on their side and they are working on a fix as we speak. Itíll be probably be fixed in a future patch. And it is to be noted that this bug doesnt effect the performance of the game in any way.
Source: AMD Mantle causes washed out graphics in Battlefield 4 | ChipLoco