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It's a very simple setup with a maya 2D grid texture connected to an aiStandardSurface via a maya bump2d node. But no effect at all. Other maya 2d textures seem to work. But I haven't tested out all of them. I am building a more complex shading network and would prefer to avoid using file texture.
I don't think most procedural textures work with bump. We've got an open ticket for that.