Hello,

I have Ubuntu 15.04 and the display is not that satisfactory with the Nouveau driver. I installed the nvidia 340.93 drivers using the system settings way. (System seetings -> additional drivers -> selecting the 340.93 driver -> apply) On the next boot, I didn't notice much improvement after the login, but I could use the computer. However after a couple of minutes, the screen turned black, with nothing showing (the only option then was a hard shutdown).
Is there a way to know why the system looks to be working normally after the login, only to have the black screen a couple of minutes later?
I tried to install the drivers again using the terminal, but I had the same result.

Many thanks in advance

Is it a laptop with Optimus? What nVidia card do you have? Is it the only graphics card in this computer?

You should examine Xorg.log for clues.

This is not a laptop with Optimus, my card is Nvidia Geforce 8800 GTS (The laptop is 7 years old, but graphics work fine under windows), and it is indeed the only graphics card in this laptop.

Thanks

After it turns black, can you switch to console with Ctrl+Alt+F3 ?

No I can't do anything, except holding the power button to force a shutdown

I'd try with older nVidia drivers. http://www.nvidia.com/Download/Find.aspx?lang=en-us