NVIDIA-SMI failed error

Hi all,

My OS is Ubuntu 16.04 LTS and GPU is GeForce 1060. I have already installed CUDA Toolkit 9.1 on my PC several days ago, which was confirmed by running the default NVIDIA_CUDA-9.1_sample ‘deviceQuery’ and ‘bandwith’.

However, when I am running the command nvidia-smi today, an error shows up as:

NVIDIA-SMI has failed because it couldn’t communicate with the NVIDIA driver. Make sure that the latest NVIDIA driver is installed and running.

During the last two days, I tried to install the PGI Community Eidtion 17.10 in order to try out the OpenACC library with Fortran programs. I stopped the PGI installation at the procedure that asked whether to install CUDA Toolkit or not, because I am not sure if this will confilict my already installed CUDA. I do not know if the PGI installation is related to the error and how to fix. Thanks for the help.


Follow the instructions in the linux install guide to clean out any old installations and reinstall CUDA 9.1


Thanks txbob! I uninstalled CUDA and Nvidia Driver. Everything works fine after the reinstallation of CUDA 9.1 as official guide tells.

I want to know whether such an error comes from the installation of PGI Community Edition? Thanks for the help.