https://bugs.freedesktop.org/show_bug.cgi?id=93649
--- Comment #65 from Marek Olšák maraeo@gmail.com --- (In reply to Amarildo from comment #27)
What I really think is that VALVe should investigate this since this problem started happening after they introduced mandatory Texture Streaming.
If you are right about texture streaming, the cso commit might fix it.