My problem is known, but still remains unsolved. After installing the latest (or any other version) of Nvidia drivers I get black screen or am unable to login.

Useful information:

• nvidia-detector shows none,



• lspci shows:

  
  
  

  00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)
  
  01:00.0 VGA compatible controller: NVIDIA Corporation GF108M [GeForce GT 630M] (rev a1)
  
  




• Ubuntu 14.04.1 x64



• linux kernel version is 3.13.0-37-generic


• Nvidia driver version is 340.46

I can switch (visually) between via nvidia-prime and Nvidia X Server Settings now, though before it was impossible due to different problems like this.

I've tried to install the latest drivers from official page, but get the same.