I can see how this can be a problem with recent nvidia drivers. I am
going to take care of this soon.

I will also look into libkmod2. Thanks

** Changed in: ubuntu-drivers-common (Ubuntu)
       Status: New => Triaged

** Changed in: ubuntu-drivers-common (Ubuntu)
   Importance: Undecided => Medium

** Changed in: ubuntu-drivers-common (Ubuntu)
     Assignee: (unassigned) => Alberto Milone (albertomilone)

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https://bugs.launchpad.net/bugs/1615058

Title:
  gpu-manager fails to unload NVIDIA modules

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

Bug description:
  I am using Ubuntu 16.04.1 LTS on a Clevo P65XSE-A with a Intel HD 5500
  (I think!?) and a GTX 970m

  When using a new NVIDIA driver from the graphics ppa
  https://launchpad.net/~graphics-drivers/+archive/ubuntu/ppa

  I noticed when switching back to the Intel card via "sudo prime-select 
intel", the NVIDIA card stays on.
  When launching gpu-manager via terminal it tells me it can't unload 
nvidia_modeset and nvidia_drm modules.

  Should probably use libkmod2 like bumblebee
  https://github.com/Bumblebee-Project/Bumblebee/pull/762

  
  Unloading nvidia-uvm with "no" parameters
  rmmod: ERROR: Module nvidia_uvm is not currently loaded
  Unloading nvidia-modeset with "no" parameters
  rmmod: ERROR: Module nvidia_modeset is in use by: nvidia_drm
  Unloading nvidia with "no" parameters
  rmmod: ERROR: Module nvidia is in use by: nvidia_modeset

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