Comment 16 for bug 191508

I found a solution in the net:
http://tombuntu.com/ (thanks 1000x to tom)

I am running ubuntu hardy fresh install on a new sony vaio with nvidia 8400gt m: nvidia-glx-new from repo:
i had no shadows.
after doing this:
$ sudo ln -sf /usr/lib/nvidia/libwfb.so.xserver-xorg-core /usr/lib/xorg/modules/libwfb.so
Everything is fine:
emerald works and shadows are back.

good luck!! :)