Hello, I have similar issues on a Toshiba Satellite notebook running Trusty 14.04 x64 and a Nvidia 540M GPU (Optimus with another on-board Intel HD).
Using 331.38 or 331.38 updates causes a freeze at the end of the splash screen shown during reboot. The Unity Greeter is never shown and the only way to regain control is to revert to console, purge all nvidia packages and use the Nouveau driver. There is nothing out of ordinary in Xorg.log. It seems to load the driver. Last lines in the log are: [ 40.403] reporting 5 8 7 53 [ 40.809] reporting 5 8 7 53 [ 41.320] reporting 5 8 7 53 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to 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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-331/+bug/1310551/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
