The "nogpumanager" parameter has been supported since ubuntu-drivers-common 1:0.2.89 in 14.04. I'm not sure why that doesn't work for you. Did you update the grub menu with "sudo update-grub" ?
The "nogpumanager" parameter has been supported since ubuntu- drivers- common 1:0.2.89 in 14.04. I'm not sure why that doesn't work for you. Did you update the grub menu with "sudo update-grub" ?