Multiple directional lights with shadows

Hi, I have problems with getting two or more directional lights to cast shadows.
I’ve set both to Render Mode: Important, tried auto as well. No difference.

Only one shadow is visible. If I tweak the intensity, the other one becomes visible. But both is never visible at the same time…

How do I fix this?

Thanks in advance!

Found a solution: change from Forward Rendering to Deffered Lighting.
If there still are any other ways please let me know!