Looking at the same webpage (http://vxlabs.com/2015/02/05/solving-the- ubuntu-14-04-nvidia-346-nvidia-prime-black-screen-issue/) in the comments ( by By JustAnotherCCppXXDummy) there is another and much simpler solution.
After you start your laptop (for optimus users - in nvidia mode), and getting the black screen of death ;), close your lid to put your laptop to sleep. Then open it and .... voila! You can now see the login screen. This worked for me like a charm with the xorg-edgers 346 drivers. OS: Ubuntu 14.04.2 64bit Laptop: Asus UX32V Desktop: Unity Kernel: 3.13.0-46-generic CPU: Intel® Core™ i7-3517U CPU @ 1.90GHz × 4 GPU: GeForce GT 620M/PCIe/SSE2 -- 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/1362848 Title: ubuntu 14.04 after install nvidia binary driver 331.89 black screen and freeze Status in nvidia-graphics-drivers-331 package in Ubuntu: Confirmed Status in nvidia-graphics-drivers-340 package in Ubuntu: Confirmed Status in nvidia-graphics-drivers-346 package in Ubuntu: Confirmed Bug description: I'm using Ubuntu 14.04 64bit, after install nvidia binary driver 331.89 from Additional Drivers application then reboot, it shows black screen, no login window, I even can't use ctrl+alt+F2 to switch to text mode, then I reboot and go to recovery mode, use 'prime-select intel' to switch to intel GPU and reboot, everything is fine, but as soon as I switch to nvidia GPU, still same issue. OS: Ubuntu 14.04 64bit Laptop: HP ENVY 15t Nvidia GeForce GT 740M + Intel HD 4600 Desktop: Unity Kernel: 3.13.0 CPU: Intel® Core™ i7-4700MQ Thanks! To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-331/+bug/1362848/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
