Comment 155 for bug 1098489

My experiments so far indicate that the errors only happen with rendering to the uncached frontbuffer, are not influenced by the number of rectangles in each primitive (though the failure does occur at different frequencies) and do not respond to adding extra MI_FLUSH. I don't think attaching examples of fail will help, as the next step will be trying to dissect the GPU state and work out why fragments fail inside a single shader.