# GPU not used, rebooted, nvidia-smi has failed

## post by kelvin on Apr 7, 2021

For some reason, tensorflow is not using GPU even it’s showing in the device list, and we rebooted the Lambda. Then:

nvidia-smi has failed because it couldn’t communicate with the NVIDIA driver.

Anyway to fix it?

## output of dpkg -l |grep nvidia

ii libnvidia-cfg1-450:amd64                450.102.04-0ubuntu0.18.04.1      amd64  NVIDIA binary OpenGL/GLX configuration library
    ii libnvidia-common-450                     450.102.04-0ubuntu0.18.04.1      all    Shared files used by the NVIDIA libraries
    ii libnvidia-compute-450:amd64              450.102.04-0ubuntu0.18.04.1      amd64  NVIDIA libcompute package
    ii libnvidia-compute-450:i386               450.102.04-0ubuntu0.18.04.1      i386   NVIDIA libcompute package
    ii libnvidia-decode-450:amd64               450.102.04-0ubuntu0.18.04.1      amd64  NVIDIA Video Decoding runtime libraries
    ii libnvidia-decode-450:i386                450.102.04-0ubuntu0.18.04.1      i386   NVIDIA Video Decoding runtime libraries
    ii libnvidia-encode-450:amd64               450.102.04-0ubuntu0.18.04.1      amd64  NVENC Video Encoding runtime library
    ii libnvidia-encode-450:i386                450.102.04-0ubuntu0.18.04.1      i386   NVENC Video Encoding runtime library
    ii libnvidia-extra-450:amd64                450.102.04-0ubuntu0.18.04.1      amd64  Extra libraries for the NVIDIA driver
    ii libnvidia-fbc1-450:amd64                 450.102.04-0ubuntu0.18.04.1      amd64  NVIDIA OpenGL-based Framebuffer Capture runtime library
    ii libnvidia-fbc1-450:i386                  450.102.04-0ubuntu0.18.04.1      i386   NVIDIA OpenGL-based Framebuffer Capture runtime library
    ii libnvidia-gl-450:amd64                   450.102.04-0ubuntu0.18.04.1      amd64  NVIDIA OpenGL/GLX/EGL/GLES GLVND libraries and Vulkan ICD
    ii libnvidia-gl-450:i386                    450.102.04-0ubuntu0.18.04.1      i386   NVIDIA OpenGL/GLX/EGL/GLES GLVND libraries and Vulkan ICD
    ii libnvidia-ifr1-450:amd64                 450.102.04-0ubuntu0.18.04.1      amd64  NVIDIA OpenGL-based Inband Frame Readback runtime library
    ii libnvidia-ifr1-450:i386                  450.102.04-0ubuntu0.18.04.1      i386   NVIDIA OpenGL-based Inband Frame Readback runtime library
    ii nvidia-compute-utils-450                 450.102.04-0ubuntu0.18.04.1      amd64  NVIDIA compute utilities
    ii nvidia-cuda-dev:amd64                    10.0.130-0lambda3                amd64  CUDA development files
    ii nvidia-cuda-doc                          10.0.130-0lambda3                all    CUDA toolkit documentation
    ii nvidia-cuda-gdb                          10.0.130-0lambda3                amd64  CUDA Debugger
    ii nvidia-cuda-toolkit                      10.0.130-0lambda3                amd64  CUDA development toolkit
    ii nvidia-dkms-450                          450.102.04-0ubuntu0.18.04.1      amd64  NVIDIA DKMS package
    ii nvidia-driver-440                        450.66-0lambda0~18.04.2          amd64  Transitional package for nvidia-driver-450
    ii nvidia-driver-450                         450.102.04-0ubuntu0.18.04.1      amd64  NVIDIA driver metapackage
    ii nvidia-kernel-common-450                 450.102.04-0ubuntu0.18.04.1      amd64  Shared files used with the kernel module
    ii nvidia-kernel-source-450                  450.102.04-0ubuntu0.18.04.1      amd64  NVIDIA kernel source package
    ii nvidia-modprobe                           455.45.01-0lambda1               amd64  utility to load NVIDIA kernel modules and create device nodes
    ii nvidia-profiler                           10.0.130-0lambda3                amd64  NVIDIA CUDA profiler
    ii nvidia-settings                           455.45.01-0lambda1               amd64  Tool for configuring the NVIDIA graphics driver
    ii nvidia-utils-450                         450.102.04-0ubuntu0.18.04.1      amd64  NVIDIA driver support binaries
    ii xserver-xorg-video-nvidia-450            450.102.04-0ubuntu0.18.04.1      amd64  NVIDIA binary Xorg driver