I found this possible solution https://devtalk.nvidia.com/default/topic/678774/linux/nvidia-331-38-frequent-ubuntu-13-10-freeze-gtx-780m-kernel-3-11/post/4105872/#4105872 I don't know if it works, I just change it and I am waiting to see if that solves the problem
-- You received this bug notification because you are a member of Desktop Packages, which is subscribed to nvidia-graphics-drivers-331 in Ubuntu. https://bugs.launchpad.net/bugs/1310551 Title: NVIDIA proprietary driver 331.38 from package nvidia-331 on Xubuntu 14.04 causes display to hang Status in “nvidia-graphics-drivers-331” package in Ubuntu: Confirmed Bug description: On 14.04 I am getting an issue on my Thinkpad T520 where running the "proprietary,tested" 331.38 driver causes my display to hang. It seems to stay that way until I switch to tty6 with ctrl+alt+f6 and then back to tty7 which has the display, this causes it to un-hang. This then happens back and forth. I am not sure but it might be triggered by clicking things, opening windows and such. The problem disappears when switching back to the open source driver. Should I try an even newer driver from nvidia, or is there any more information you need for troubleshooting? ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: nvidia-331 331.38-0ubuntu7 ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9 Uname: Linux 3.13.0-24-generic x86_64 NonfreeKernelModules: nvidia ApportVersion: 2.14.1-0ubuntu3 Architecture: amd64 CurrentDesktop: XFCE Date: Mon Apr 21 12:29:36 2014 InstallationDate: Installed on 2014-03-18 (33 days ago) InstallationMedia: Xubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140318) SourcePackage: nvidia-graphics-drivers-331 UpgradeStatus: No upgrade log present (probably fresh install) modified.conffile..etc.modprobe.d.nvidia.331.hybrid.conf: [deleted] To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-331/+bug/1310551/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp

