when I run sample 1_Utilities result = Fail with ukown error

[nk0307]

$ ./deviceQuery
./deviceQuery Starting...

CUDA Device Query (Runtime API) version (CUDART static linking)

cudaGetDeviceCount returned 999
-> unknown error
Result = FAIL

[mdoijade]

please provide more details, which cuda toolkit been installed? driver version? OS ?
Can you share output of "nvidia-smi" ?

[awhitesong]

@mdoijade I'm facing the same issue.

./deviceQuery Starting...

CUDA Device Query (Runtime API) version (CUDART static linking)

cudaGetDeviceCount returned 999
-> unknown error
Result = FAIL

I'm using Ubuntu 16.04 and installed nvidia-418 driver through the package manager/graphics-drivers ppa. Then I installed through cuda-repo-ubuntu1604-10-1-local-10.1.105-418.39_1.0-1_amd64.deb and ran sudo apt-get install cuda for complete installation (didn't install cuda-toolkit separately. Here: https://docs.nvidia.com/cuda/cuda-installation-guide-linux/index.html#package-manager-metas).

This is what nvidia-smi -a shows.

==============NVSMI LOG==============
Timestamp                           : Sat May 18 16:00:21 2019

Driver Version                      : 418.56
CUDA Version                        : 10.1

Attached GPUs                       : 1
GPU 00000000:07:00.0
    Product Name                    : GeForce GT 740M
    Product Brand                   : GeForce
    Display Mode                    : N/A
    Display Active                  : N/A
    Persistence Mode                : Disabled
    Accounting Mode                 : N/A
    Accounting Mode Buffer Size     : N/A
    Driver Model
        Current                     : N/A
        Pending                     : N/A
    Serial Number                   : N/A
    GPU UUID                        : GPU-c6f245ee-6e91-a68b-6ba4-2888ac47b7ce
    Minor Number                    : 0
    VBIOS Version                   : 80.28.2C.00.08
    MultiGPU Board                  : N/A
    Board ID                        : N/A
    GPU Part Number                 : N/A
    Inforom Version
        Image Version               : N/A
        OEM Object                  : N/A
        ECC Object                  : N/A
        Power Management Object     : N/A
    GPU Operation Mode
        Current                     : N/A
        Pending                     : N/A
    GPU Virtualization Mode
        Virtualization mode         : N/A
    IBMNPU
        Relaxed Ordering Mode       : N/A
    PCI
        Bus                         : 0x07
        Device                      : 0x00
        Domain                      : 0x0000
        Device Id                   : 0x129210DE
        Bus Id                      : 00000000:07:00.0
        Sub System Id               : 0x380A17AA
        GPU Link Info
            PCIe Generation
                Max                 : N/A
                Current             : N/A
            Link Width
                Max                 : N/A
                Current             : N/A
        Bridge Chip
            Type                    : N/A
            Firmware                : N/A
        Replays Since Reset         : 0
        Replay Number Rollovers     : 0
        Tx Throughput               : N/A
        Rx Throughput               : N/A
    Fan Speed                       : N/A
    Performance State               : P0
    Clocks Throttle Reasons         : N/A
    FB Memory Usage
        Total                       : 2004 MiB
        Used                        : 5 MiB
        Free                        : 1999 MiB
    BAR1 Memory Usage
        Total                       : N/A
        Used                        : N/A
        Free                        : N/A
    Compute Mode                    : Default
    Utilization
        Gpu                         : N/A
        Memory                      : N/A
        Encoder                     : N/A
        Decoder                     : N/A
    Encoder Stats
        Active Sessions             : N/A
        Average FPS                 : N/A
        Average Latency             : N/A
    FBC Stats
        Active Sessions             : N/A
        Average FPS                 : N/A
        Average Latency             : N/A
    Ecc Mode
        Current                     : N/A
        Pending                     : N/A
    ECC Errors
        Volatile
            Single Bit            
                Device Memory       : N/A
                Register File       : N/A
                L1 Cache            : N/A
                L2 Cache            : N/A
                Texture Memory      : N/A
                Texture Shared      : N/A
                CBU                 : N/A
                Total               : N/A
            Double Bit            
                Device Memory       : N/A
                Register File       : N/A
                L1 Cache            : N/A
                L2 Cache            : N/A
                Texture Memory      : N/A
                Texture Shared      : N/A
                CBU                 : N/A
                Total               : N/A
        Aggregate
            Single Bit            
                Device Memory       : N/A
                Register File       : N/A
                L1 Cache            : N/A
                L2 Cache            : N/A
                Texture Memory      : N/A
                Texture Shared      : N/A
                CBU                 : N/A
                Total               : N/A
            Double Bit            
                Device Memory       : N/A
                Register File       : N/A
                L1 Cache            : N/A
                L2 Cache            : N/A
                Texture Memory      : N/A
                Texture Shared      : N/A
                CBU                 : N/A
                Total               : N/A
    Retired Pages
        Single Bit ECC              : N/A
        Double Bit ECC              : N/A
        Pending                     : N/A
    Temperature
        GPU Current Temp            : 52 C
        GPU Shutdown Temp           : N/A
        GPU Slowdown Temp           : N/A
        GPU Max Operating Temp      : N/A
        Memory Current Temp         : N/A
        Memory Max Operating Temp   : N/A
    Power Readings
        Power Management            : N/A
        Power Draw                  : N/A
        Power Limit                 : N/A
        Default Power Limit         : N/A
        Enforced Power Limit        : N/A
        Min Power Limit             : N/A
        Max Power Limit             : N/A
    Clocks
        Graphics                    : N/A
        SM                          : N/A
        Memory                      : N/A
        Video                       : N/A
    Applications Clocks
        Graphics                    : 980 MHz
        Memory                      : 900 MHz
    Default Applications Clocks
        Graphics                    : 980 MHz
        Memory                      : 900 MHz
    Max Clocks
        Graphics                    : N/A
        SM                          : N/A
        Memory                      : N/A
        Video                       : N/A
    Max Customer Boost Clocks
        Graphics                    : N/A
    Clock Policy
        Auto Boost                  : N/A
        Auto Boost Default          : N/A
    Processes                       : N/A

Then compiled the samples and ran ./devicequery

When I compile and test cudnn through ./mnistCUDNN it shows the same error:

Error: unknown error
error_util.h:93

The code at error_util.h:93 is again the same function:

checkCudaErrors(cudaGetDeviceCount( &totalDevices ));

[mdoijade]

@awhitesong this seems to be installation error and/or setup issue, you can post this query on nvidia cuda developer forum to get help - https://devtalk.nvidia.com/default/board/58/
I am closing this issue as this is not due to the sample source.