Shadow gradient on walls

Hi, as I show in this two screenshots, I have this problem with walls, where the shadow makes “jumps” instead of a smooth gradient. The only light applied is the new sun and sky system, both (sun and sky on stationary. Lightmaps are big enough (red in the lightmap density mode)¿Somebody knows where is the problem? Thank you!

Turn off lightmap compression

Thank you so much mate! Problem solved!