[vtkusers] Issue with threads and nvidia driver (linux)

[Marco Morandini]

I'm on linux, vtk 6.2 built from sources.

The attached test program works fine on my laptopt (intel graphic with 
i915 kernel driver).

However, it does not work on my desktop, with a Titan nvidia card and 
the latest nvidia driver (x86_64, 381.09). If I hit the "q" key the 
program exits correctly, but I'm not able to rotate the cylinder using 
the mouse. Everything works fine, instead, if I call iren->Start() from 
main and not from a separate thread.

I'm really clueless, and would really appreciate any help in sorting 
this out.

I'm building the program with

g++ -Wall -I $HOME/local/Fenics/include/vtk-6.2 -c -g debug.C -pthread
g++ -Wall -o debug debug.o -L$HOME/local/Fenics/lib -lvtkCommonCore-6.2 
-lvtkRenderingCore-6.2 -lvtkCommonExecutionModel-6.2 
-lvtkFiltersSources-6.2 -lvtkInteractionStyle-6.2 
-lvtkInteractionWidgets-6.2 -lvtkRenderingOpenGL-6.2 
-lvtkRenderingVolumeOpenGL-6.2 -lvtkRenderingFreeType-6.2 
-lvtkRenderingFreeTypeOpenGL-6.2 -pthread

Thanks in advance,

Marco
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