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[kcpr <1362848@xxxxxxxxxxxxxxxxxx>]

Same problem. Like in Martinas' story everything worked great and I did nothing special, but yesterday after tring 'prime-select nvidia' I got a black login screen. Tried reinstalling drivers and all other stuff like that, with no luck. I just noticed that then I've got this black login screen I can suspend my laptop (by closing it) and after restoring sometimes - not always - I've got a normal unity greeter. It's not a solution, not even a real workaround.
Anyway this bug sucks, aspecially because it just suddenly appered without any good reason. :/ 
Just fix it!

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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

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!

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