I believe this is a very common problem with Nvidia GPU and I see a lot of discussion about it. See here from two yrs ago. I followed the suggested solutions but nothing works. So I suspect it's still unresolved. Can someone please give an update on what works for ubuntu 14.04.
Here is how i got into this mess. So please don't repeat.
I have a new Dell Precision 5810 with an entry level Nvidia card (NVS 310) and the Nvidia driver pre-installed. I want to replace it with a GeForce GTX 660 Ti. So I went to the Nvidia site and download cuda_7.5.18_linux.run and ran it at Ctrl-Alt-F1.
The install succeeded, ie. I did not see any error msg.
After reboot, the login screen at terrible resolution came back. When I type password, it flashes then give the same login screen again. So basically, login fails.
I went to command line again (Ctrl-Alt-F1) and type
lshw -c video
and I see
*-display UNCLAIMED
description: VGA compatible controller
product: GF119 [NVS 310]
vendor: NVIDIA Corporation
physical id: 0
.....
configuration: latency=0
resources: memory ......
*-display ...
......
product: GK104 [GeForce GTX 660 Ti]
....
I tried the following :
a. try to uninstall all Nvidia stuff by,
cuda_7.5.18_linux.run --uninstall
b. following Nvidia doc, I type
nvidia-uninstall
I still couldn't get ride of Nvidia driver. Here is my system info
kernel : 3.19.0-80-generic
