https://bugs.freedesktop.org/show_bug.cgi?id=95198
--- Comment #2 from Ernst Sjöstrand ernstp@gmail.com --- I get very different behavior if I patch Mesa to report 4.3 support vs. MESA_GL_VERSION_OVERRIDE=4.3 MESA_GLSL_VERSION_OVERRIDE=430. Is that intended? There's no environment variable that behaves like if I did such a Mesa patch?
Short story, much fewer issues (or harder to repro?) when patching Mesa to report 4.3.