August 2012: article has been completely rewritten and updated. For driver-specific issues, please refer to this article.
Want to have both your GTX and Radeon working as OpenCL-devices under Linux? The bad news is that attempts to get Radeon as a compute device and the GTX as primary all failed. The good news is that the other way around works pretty easy (with some luck). You need to install both drivers and watch out that libglx.so isn’t overwritten by NVidia’s driver as we won’t use that GPU for graphics – this is also the reason why it is impossible to use the second GPU for OpenGL.
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