desktop-packages team mailing list archive

[Viktor Ferenczi <1361207@xxxxxxxxxxxxxxxxxx>]

I faced this problem on Ubuntu 15.04. The missing device nodes / kernel
module can manifest in all kind of failures and error messages,
depending on which application you try to use. Due to the misleading
error messages it took hours to finally track down the issue and find
this ticket with the correct explanation and solution. Installing the
nvidia-modprobe package solved the problem instantly. Having this
package recommended with the nvidia driver and/or a dependency of the
nvidia-cuda-toolkit package could have saved this wasted effort.

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You received this bug notification because you are a member of Desktop
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https://bugs.launchpad.net/bugs/1361207

Title:
  [xorg-edgers] nvidia-graphics-drivers-331 and newer should recommend
  nvidia-modprobe

Status in nvidia-graphics-drivers-331 package in Ubuntu:
  Confirmed
Status in nvidia-graphics-drivers-331-updates package in Ubuntu:
  Confirmed
Status in nvidia-graphics-drivers-340 package in Ubuntu:
  Confirmed
Status in nvidia-graphics-drivers-340-updates package in Ubuntu:
  Confirmed
Status in nvidia-graphics-drivers-346 package in Ubuntu:
  Confirmed
Status in nvidia-graphics-drivers-346-updates package in Ubuntu:
  Confirmed

Bug description:
  nvidia-modprobe allows non-root users to load NVIDIA kernel modules and it creates the respective device entries. This is important for CUDA users as they would otherwise have to run a workaround script to load the kernel modules and create the device entries. This is documented here:
  http://developer.download.nvidia.com/compute/cuda/6_5/rel/docs/CUDA_Getting_Started_Linux.pdf -> 4.8 Verification

  Because of this newer nvidia-graphics-drivers packages (331 and newer)
  should at least recommend nvidia-modprobe. Furthermore the nvidia-
  modprobe is not available from xorg-edgers. Utopic includes an nvidia-
  modprobe package though.

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