smoki, your comments on Phoronix don't make much sense I'm afraid.

First of all, there's no such thing as no vertex or pixel shader for a Gallium
driver. The state tracker always provides both shaders to the driver, even if
they don't do anything but pass through values.

I don't think there's anything particularly special about this bug; someone
will just have to track down and fix it. Your apitraces will be useful for
that, thanks.