Comment 9 for bug 1642662

@Jerry Kao
This is standard Ubuntu 14.04.05 LTS.

For some reason the Nvidia driver doesn't create the egl group for my computer, for example:

$ update-alternatives --config x86_64-linux-gnu_egl_conf
There are 2 choices for the alternative x86_64-linux-gnu_egl_conf (providing /etc/ld.so.conf.d/x86_64-linux-gnu_EGL.conf).

  Selection Path Priority Status
------------------------------------------------------------
* 0 /usr/lib/x86_64-linux-gnu/mesa-egl/ld.so.conf 500 auto mode
  1 /usr/lib/x86_64-linux-gnu/libhybris-egl/ld.so.conf 400 manual mode
  2 /usr/lib/x86_64-linux-gnu/mesa-egl/ld.so.conf 500 manual mode

However the gl group is normal:

$ update-alternatives --config x86_64-linux-gnu_gl_conf
There are 3 choices for the alternative x86_64-linux-gnu_gl_conf (providing /etc/ld.so.conf.d/x86_64-linux-gnu_GL.conf).

  Selection Path Priority Status
------------------------------------------------------------
  0 /usr/lib/nvidia-370/ld.so.conf 8604 auto mode
* 1 /usr/lib/nvidia-370-prime/ld.so.conf 8603 manual mode
  2 /usr/lib/nvidia-370/ld.so.conf 8604 manual mode
  3 /usr/lib/x86_64-linux-gnu/mesa/ld.so.conf 500 manual mode

That's why this update broke my Optimus and I am stuck in Intel mode. Like I said it's a Nvidia Quadro K3100M system which is not quite common. Could that be related?