I had the problem on a Toshiba Portege Z830. This unit hasn't got a NVIDIA card but somehow Ubuntu (during install) installed the 'nvidia- settings' and 'nvidia-current' pacakges which cause Unity to not have effects and my screen being blurred.
Removing 'nvidia-settings' and 'nvidia-current' followed by a reconfigure of Xorg solved the issue. The following nudged me in the right way to fix it: https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/987949/comments/14 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/987949 Title: Ubuntu 12.04 - Severe Graphics Regression on Hybrid System with Integrated Intel HD300 graphics and NVIdia OPTIMUS To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/987949/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
