https://bugs.freedesktop.org/show_bug.cgi?id=28069
--- Comment #9 from Paulo César Pereira de Andrade pcpa@mandriva.com.br 2010-05-20 16:30:19 PDT --- Just for the record, I made a build commenting the call to glxMakeCurrent() and tested on an ati and intel card.
In the ati, it appears to have resolved the issue, but framerates become reported as like 9 fps, and it was indeed somewhat choppy, but the car did not keep "jumping". With the intel card it did not make any difference, and still LIBGL_ALWAYS_INDIRECT=true would correct the issue in the alternate build (and framerate as over 150 fps in both cards/computers).
[ talking about intel card because I also reported the problem in https://bugs.freedesktop.org/show_bug.cgi?id=28002 ]