Comment 1 for bug 1419017

I have resolved the problem on my machine, and to do so, it was some combination of the following:

- Removing all NVIDIA drivers (+ purging nvidia*)
- Blacklisting Nouveau from XOrg Modules
- Installing proprietary NVIDIA drivers from website and rebooting
- Doing the dconf reset /org/compiz & setsid unity hacks
- Attaching to the xorg-edgers PPA and installing nvidia-346 package ( to cover some missing i386 drivers)

It now appears to be working correctly.

It seems that the bug, then, is that when installing graphics drivers, the OpenGL and compositing modules are not being ported / re-enabled correctly.

I'm not sure if this is a Unity, Compiz, or Driver-installation-script problem, though.

The problem began when I switched out the video card and installed the new drivers.