After a little discussion at ubuntuforums.org someone noticed that this problem is related to the driver build from ubuntu. I have installed the proprietary driver from nvidia and now the shadows are back.
I hope this helps to solve the problem.
After a little discussion at ubuntuforums.org someone noticed that this problem is related to the driver build from ubuntu.
I have installed the proprietary driver from nvidia and now the shadows are back.
I hope this helps to solve the problem.