Install nvidia cuda driver for centos 7 in an asus laptop model TP300L with a Nvidia GEFORCE 820M GPU.

Refer to:
NVIDIA CUDA Getting Started Guide for Linux: 
http://docs.nvidia.com/cuda/cuda-getting-started-guide-for-linux/#axzz3pgS6QfpV

May also be useful: 
http://docs.nvidia.com/cuda/cuda-installation-guide-linux/

1. Download rpm for local installation at https://developer.nvidia.com/cuda-downloads. As of this time, cuda-8 is available for centos 7: 


## http://developer.download.nvidia.com/compute/cuda/7.5/Prod/local_installers/cuda-repo-rhel7-7-5-local-7.5-18.x86_64.rpm ## osolete

https://developer.nvidia.com/compute/cuda/8.0/Prod2/local_installers/cuda-repo-rhel7-8-0-local-ga2-8.0.61-1.x86_64-rpm

Installation Instructions:
`sudo rpm -i cuda-repo-rhel7-8-0-local-ga2-8.0.61-1.x86_64-rpm`
`sudo yum clean all`
`sudo yum install cuda`

Refer to: 
https://kerpanic.wordpress.com/2015/05/29/installing-cuda-7-on-centos-7-the-golden-path-for-opengl-samples-to-work/

2. systemctl set-default multi-user.target

3. reboot

4. Upon rebooting, enter the terminal as root and type
echo -e "blacklist nouveau\noptions nouveau modeset=0" > /etc/modprobe.d/disable-nouveau.conf

5. dracut --force

6. nvidia-xconfig

7. Set the library paths for CUDA 7 libraries on boot       

$ cd  /etc/profile.d

$ vim cudapaths.sh

Type the following into the cudapaths.sh script.

export LD_LIBRARY_PATH=/usr/local/cuda-7.5/lib64:$LD_LIBRARY_PATH

8. yum install mesa-libGLES.x86_64 mesa-libGL-devel.x86_64 mesa-libGLU-devel.x86_64 mesa-libGLw.x86_64 mesa-libGLw-devel.x86_64 libXi-devel.x86_64 freeglut-devel.x86_64 freeglut.x86_64

9. Download drivers here: http://www.geforce.com/drivers/results/84721

http://us.download.nvidia.com/XFree86/Linux-x86_64/346.72/NVIDIA-Linux-x86_64-346.72.run


10. In case installation of cuda failed, you can regenerate the /etc/X11/xorg.conf file using the command

Xorg :1 -configure

This will create the file /root/xorg.conf.new, which you can then copy to /etc/X11/xorg.conf:

cp /root/xorg.conf.new /etc/X11/xorg.conf

reboot

11. If your screen hang upon rebooting, type Ctrl + alt + F2 to boot into a terminal. 

12. startx upon login to see if gui can be launched. 

12. You may need some command for setting init level, just in case: 

systemctl get-default
systemctl set-default graphical.target


13. Setting environmental paths are mandatory: 

export PATH=/usr/local/cuda-7.5/bin:$PATH
export LD_LIBRARY_PATH=/usr/local/cuda-7.5/lib64:$LD_LIBRARY_PATH

13. Verification: If CUDA is successfully compiled, 

nvcc -V

should give output such as 
nvcc: NVIDIA (R) Cuda compiler driver
Copyright (c) 2005-2015 NVIDIA Corporation
Built on Tue_Aug_11_14:27:32_CDT_2015
Cuda compilation tools, release 7.5, V7.5.17