https://bugs.freedesktop.org/show_bug.cgi?id=73528
--- Comment #23 from Marek Olšák maraeo@gmail.com --- Created attachment 109669 --> https://bugs.freedesktop.org/attachment.cgi?id=109669&action=edit verify the bisected commit
Can you test the attached patch with Mesa master? It will help to verify that the bisected commit is the culprit.