I get banding artifacts when using displacement (the output node one, not the modifier, and it is set to "Bump", not "True") in Cycles.
At first I used a 8-bit greyscale texture and I expected to get banding, but then I blurred the texture in the Compositor and saved the result as a full-float .exr file. I then replaced the 8-bit texture with the .exr file. So it should have more than enough information to avoid banding and the blurring should also have at least reduced the sharpness of the banding, if not completely removed it because the steps were pretty close together.
Note: I made a mistake creating the texture, which makes the question unnecessary. Sorry.
That doesn't happen though, and I'm wondering why that is and if anyone has a solution for this. Here I found a similar problem, but there the question is how to save .exr-files. That's not my problem.
Also, this answer could be relevant but I don't find those settings for a texture that is used as a node inside of a cycles material. I also think the problem there is slightly different because the modifier behaves differently.
This is an example of what the result looks like:
Thanks for any help.