[Bug 941826] Re: dlopen(libGL.so) resolves to mesa rather than nvidia

[Jörn Schönyan]

barcc, that second approach won't work.

import ctypes
from ctypes import util
ctypes.CDLL(util.find_library('GL'), ctypes.RTLD_GLOBAL)

That should be better, but I can't reproduce the bug myself, likely
because it's an Optimus notebook.

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https://bugs.launchpad.net/bugs/941826

Title:
  dlopen(libGL.so) resolves to mesa rather than nvidia

Status in NVIDIA Drivers Ubuntu:
  New
Status in “mesa” package in Ubuntu:
  Confirmed
Status in “nvidia-graphics-drivers-331-updates” package in Ubuntu:
  Confirmed
Status in “pyqt5” package in Ubuntu:
  Invalid
Status in “python-qt4” package in Ubuntu:
  Invalid

Bug description:
  I'm having trouble with a combination of NVIDIA + Python + Qt +
  Opengl.

  I tried using a QGraphicsView on a QGLWidget. I'm getting a white window and errors like this these:
  QGLShader: could not create shader
  Vertex shader for simpleShaderProg (MainVertexShader &PositionOnlyVertexShader) failed to compile

  This is an example application triggering the problem:
  http://pastebin.com/R0aa8ejs

  The 'same' program works flawlessly when using C++/Qt. I'm seeing the exact behavior when using PySide instead of PyQt4 by the way. I'm also seeing this error when trying the original demo application from python-qt4-doc. Also, calling
  QtGui.QApplication.setGraphicsSystem("opengl")
  produces the same errors.

  I'm experiencing this problems on 11.10 and 12.04 with the ubuntu-
  provided nvidia drivers (where 12.04 includes the most recent driver
  for now). After installing the driver using the original NVidia
  installer, the applications work as expected.

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