I have tested under Kubuntu 9.04 + ATI 4670 and the driver doesn't
support pbuffer but the fallback opens up a full screen window and it
works fine.
I have also tested under Kubuntu 10.10 + ATI 4670 and the driver does
support pbuffer and the app runs correctly.
In Ubuntu 9.10 with a Nvidia GTX 280 with driver version 190.53 it works
fine.
Oliver, maybe you should try a low level pbuffer example to discard it
as the problem. First, you can use an OpenGL extension checker and
search for WGL_ARB_pbuffer, I think GPU-Z does the job.
Juan
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