I have a number of CUDA development machines running Ubuntu Linux with NVIDIA GPUs (various GPUs, including GTX 980Ti, Titan X, 1080, 590 etc). In the past, I have always installed at least two graphics card on each machine - use the low-end card for display, and high-end card for dedicated computing.
I recently came across this post:
it looks like it is possible to use Intel HD GPU to handle displays, while reserving the NVIDIA devices for computing on the same machine. However, after following the procedures on two 14.04 boxes, I could not get this to work - either the Intel driver is used, or nvidia driver, but not the same time.
Is this approach feasible at all? does it work with only hybrid graphics systems? anyone has experience?