primusrun is not using discrete GPU with paraview
with a builded ParaView (5.6 or master), on a laptop with a discrete nvidia card and an integrated intel chipset, the following behavior can be observed :
./bin/paraview
Help -> About -> OpenGL : Mesa...
optirun ./bin/paraview
Help -> About -> OpenGL : Nvidia...
primusrun ./bin/paraview
Help -> About -> OpenGL : Mesa The last part is unexepected
With ParaView 5.6 release, this behavior does not appear.
This behavior is not only a reporting error but a performance drop with complex rendering can also be observed.
glxinfo and glxgears do not show this behavior.
On ArchLinux, with nvidia 418.56, bumblebee 3.2.1, primus 20151110
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