intel gpu display and cuda compute

[Stephenwei]

Hi,
My distro is ubuntu 14.04 and I was setup intel driver to display
xwindow(prime-select intel).

I refer the URL to try to compute on NVIDIA 

https://devtalk.nvidia.com/default/topic/991849/-solved-run-cuda-on-dedicated-nvidia-gpu-while-connecting-monitors-to-intel-hd-graphics-is-this-possible-/

When I increase  /usr/local/cuda/lib64:/usr/lib/nvidia-XXX to
LD_LIBRARY_PATH

vaapih264dec show's the ERROR message
XIO:  fatal IO error 2 (No such file or directory) on X server ":0"
      after 37 requests (37 known processed) with 0 events remaining.

So, could anyone gives the suggestion? 
Thank you.



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