https://bugs.freedesktop.org/show_bug.cgi?id=74718
--- Comment #8 from Dieter Nützel Dieter@nuetzel-hh.de --- Is this still a problem for you?
Looks very similar as mesa-demos/glsl/geom-outlining-150 on my RV730 AGP. I have a geom-outlining-150-shader.log with R600_DEBUG=gs,vs,fs,ps if needed.