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[Brian Murray <brian@xxxxxxxxxx>]

You might try running ubuntu-drivers list and or ubuntu-drivers devices.

** Tags added: vivid

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https://bugs.launchpad.net/bugs/1448593

Title:
  gpu-manager cannot find Nvidia gpu

Status in ubuntu-drivers-common package in Ubuntu:
  New

Bug description:
  On Ubuntu 15.04, gpu manager cannot find my gpu. I have a Nvidia gtx
  760 and am using the proprietary drivers (346-updates)

  output of systemctl status gpu-manager.service: 
  ● gpu-manager.service - Detect the available GPUs and deal with any system changes
     Loaded: loaded (/lib/systemd/system/gpu-manager.service; enabled; vendor preset: enabled)
     Active: inactive (dead) since Sat 2015-04-25 10:56:48 CDT; 26min ago
    Process: 670 ExecStart=/usr/bin/gpu-manager --log /var/log/gpu-manager.log (code=exited, status=0/SUCCESS)
   Main PID: 670 (code=exited, status=0/SUCCESS)

  Apr 25 10:56:47 knil-PC systemd[1]: Starting Detect the available GPUs and deal with any system changes...
  Apr 25 10:56:47 knil-PC gpu-manager[670]: /etc/modprobe.d is not a file
  Apr 25 10:56:47 knil-PC gpu-manager[670]: /etc/modprobe.d is not a file
  Apr 25 10:56:47 knil-PC gpu-manager[670]: /etc/modprobe.d is not a file
  Apr 25 10:56:47 knil-PC gpu-manager[670]: /etc/modprobe.d is not a file
  Apr 25 10:56:48 knil-PC gpu-manager[670]: update-alternatives: error: no alternatives for x86_64-linux-gnu_gfxcore_conf
  Apr 25 10:56:48 knil-PC systemd[1]: Started Detect the available GPUs and deal with any system changes.

  also, I'm not sure if it's connected but this is a line in journctl :
  Apr 25 10:56:47 knil-PC nvidia-persistenced[485]: Failed to query
  NVIDIA devices. Please ensure that the NVIDIA device files
  (/dev/nvidia*) exist, and that user 117 has read and write permissions
  for those files. user 117 is nvidia-persistenced, the device files do
  exist, and it should be able to access them.

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