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[cardonator <bj.cardon@xxxxxxxxx>]

I am getting the same thing. After logout/login it will go to a black
screen. If you restart sddm it will come back up with MESA driver.

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https://bugs.launchpad.net/bugs/1412057

Title:
  nvidia-prime 0.7 does not work as expected  in 15.04

Status in nvidia-prime package in Ubuntu:
  Confirmed

Bug description:
  Last days nvidia-prime 0.7 has been released but this version, like
  previous one, does not work in Vivid.

  I'm not sure exactly how long this problem exists (i think something
  like 2-3 or more weeks), but it is impossible to switch to nvidia
  profile. Before nvidia-settings package offered controls to switch
  profile Nvidia/Intel but now its gone.

  If we try:
  #prime-select nvidia

  we have:
  Info: the current alternatives in use are: ['mesa', 'mesa']
  Info: selecting nvidia-346 for the nvidia profile
  update-alternatives: using /usr/lib/nvidia-346/ld.so.conf to provide /etc/ld.so.conf.d/x86_64-linux-gnu_GL.conf (x86_64-linux-gnu_gl_conf) in manual mode
  update-alternatives: using /usr/lib/nvidia-346/alt_ld.so.conf to provide /etc/ld.so.conf.d/i386-linux-gnu_GL.conf (i386-linux-gnu_gl_conf) in manual mode

  so it seems like switching to nvidia profile, but after relogin or
  reboot again mesa is marked as used.

  If we try:
  #prime-switch nvidia

  we have:
  /etc/modprobe.d is not a file
  /etc/modprobe.d is not a file
  /etc/modprobe.d is not a file
  /etc/modprobe.d is not a file
  update-alternatives: error: no alternatives for x86_64-linux-gnu_gfxcore_conf
  update-alternatives: using /usr/lib/x86_64-linux-gnu/mesa/ld.so.conf to provide /etc/ld.so.conf.d/x86_64-linux-gnu_GL.conf (x86_64-linux-gnu_gl_conf) in manual mode
  update-alternatives: using /usr/lib/i386-linux-gnu/mesa/ld.so.conf to provide /etc/ld.so.conf.d/i386-linux-gnu_GL.conf (i386-linux-gnu_gl_conf) in manual mode
  update-alternatives: error: no alternatives for x86_64-linux-gnu_gfxcore_conf

  I have tried various driver versions but none of them work now.

  I'm running:
  Kubuntu 15.04 (current/daily)
  Kernel: 3.18.0-9

  If you need any extra info, please comment.

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