Had the same problem, so I wrote one myself.:
https://gist.github.com/WoodenDoors/6083e0a9d6927e22214493680c1f3a1c
First time writing something like that, so I don't know if it's any
good, but maybe it's still useful to someone.
--
You received this bug notification because you are a member of
Package: virtualbox-guest-x11
Version: 4.1.14-dfsg-1
I would like to confirm that after the Xorg update to 2:1.12.1-2 Debian
Wheezy's Gnome 3D did not work anymore in Virtualbox. Fallback mode is
activated since.
Going back to the snapshot taken BEFORE the update took place showed the Gnome
3
