I have a MSI GT60 Laptop with an Optimus enabled GTX 670M GPU, and I have been trying to get CUDA going in Ubuntu 12.04 environment. I realize that Optimus is not supported in Linux, but I have read the following post suggesting that CUDA works for hybrid GPUs.

How can I get nVidia CUDA or OpenCL working on a laptop with nVidia discrete card/Intel Integrated Graphics?

I installed the NVIDIA driver via

    sudo add-apt-repository ppa:ubuntu-x-swat/x-updates
    sudo apt-get update
    sudo apt-get install nvidia-current

The resulting driver version is 302.17, and supposedly GTX 670M is supported since 295.59. I also downloaded CUDA 4.2 from the NVIDIA site, and compiled it against nvidia-current libraries.

Unfortunately, when I run deviceQuery in the CUDA SDK, I get the following output

    cudaGetDeviceCount returned 38
    -> no CUDA-capable device is detected

Checking /proc/driver/nvidia/gpus/0/information gives the following

    Model:           GeForce GTX 670M
    IRQ:             16
    GPU UUID:        GPU-????????-????-????-????-????????????
    Video BIOS:      ??.??.??.??.??
    Bus Type:        PCI-E
    DMA Size:        32 bits
    DMA Mask:        0xffffffffff
    Bus Location:    0000:01.00.0

Here is the output of "lspci | grep VGA"

    00:02.0 VGA compatible controller: Intel Corporation Ivy Bridge Graphics Controller (rev 09)
    01:00.0 VGA compatible controller: NVIDIA Corporation Device 1213 (rev ff)

So... what am I doing wrong?

Thanks!