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When I start some processing sketches on my XUbuntu 14.04 64bit box I get an error message "libEGL warning: DRI2: failed to authenticate". Does this error matter ? I do not recognize any loss in performance. I can set the environment variable EGL_DRIVER="egl_glx" and force libegl to use glx instead of what seems like a buggy DRI2 implementation, but although the error disappears I see no increase in framerate.