Today, I did an upgrade of xserver-xorg (1:7.6+7ubuntu7), and the problem was solved. No more problems.
The nvidea driver I use is: 285.05.09-0ubuntu1~oneiric~xup1 -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to nvidia-settings in Ubuntu. https://bugs.launchpad.net/bugs/873375 Title: nvidia-settings freeze on activating TwinView To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nvidia-settings/+bug/873375/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp
