https://bugzilla.kernel.org/show_bug.cgi?id=178281
--- Comment #15 from fin4478@hotmail.com --- New Mesa did not fix this. Playing at fullhd TR Legend still hangs xserver in 3 minutes. Tried 2 times, same effect. Works as good as with an 300Hz overclocked non debug 4.9-rc2 kernel from kernel.org, where Unigine Heaven windows benchmark runs ok.
I do not know why my first gameplay after updating mesa was long and did not hang xserver.