I have a laptop Asus K53s with nVidia GeForce GT 540M. I (freshly) installed Ubuntu 14.04 64bit and set up
nvidia-331 proprietary driver for the graphic card. I set prime option to run nVidia acceleration and it used to work fine.
On 25th Janaury 2015, there was an Ubuntu software update (from apt log I saw it was updated
nvidia-settings, and other stuff) after which I see a black screen instead of the login screen.
I tried to switch to intel graphic card (sudo prime-switch intel) but it gives erros, it is not able to switch to intel.
I tried to purge
nvidia* and then install
nvidia-340, but it still shows black screen instead of login.
The only way to use my laptop is to install:
apt-get install nvidia-current-updates
which is the driver
nvidia-304. But it uses the intel graphics card. It is not possible switch to nVidia neither with
sudo prime-switch nvidia
nvidia-setting graphic utility.
I need to use my nVidia card for graphic acceleration (OpenGL). At the moment the laptop is too slow for my activity (CAD).