OpenGL fbo stencil attachment not working

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I'm using an Fx5200 and the latest linux drivers that support framebuffer objects. I can get fbo rendering to work fine using a texture for the color attachment and a renderbuffer for the depth attachement.But when I try attaching a renderbuffer to the stencil attachement it does not work. here is my code:
glGenFramebuffersEXT(1, &mainfb);
glGenRenderbuffersEXT(1, &depthrb);
glGenRenderbuffersEXT(1, &stencilrb);

glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, mainfb);
tex1->attach_to_fbo_color();
opengl::printerror("D");
glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, stencilrb);
opengl::printerror("E");
glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_STENCIL_INDEX8_EXT, 512, 512);
opengl::printerror("F");
glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_STENCIL_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT, stencilrb);
opengl::printerror("G");
glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, depthrb);
opengl::printerror("H");
glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_DEPTH_COMPONENT24, 512, 512);
opengl::printerror("I");
glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT, depthrb);
opengl::printerror("J");

opengl::check_fbo();

the opengl::printerror() calls just work out what error was generated if any, by the preceding commands. There are no errors generated by any commands except for the following two lines which both generate an invalid enumeration error: glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_STENCIL_INDEX8_EXT, 512, 512); glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_STENCIL_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT, stencilrb); when I check the fbo for completeness afterwards it does say that it is complete but there is no stencil buffer. Is this a driver bug or am I doing something wrong??

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