https://bugs.freedesktop.org/show_bug.cgi?id=93017
--- Comment #10 from polo lathanderjk@gmail.com --- https://wiki.archlinux.org/index.php/PRIME
DRI_PRIME=1 need xrandr compositing and crash with 4.1(3.19up) with multiple glmatrix running simultaneously after few minutes or game... 4.3 glmarix works fine for couple hours and crash randomly during gameplay same 4.2 maybe is completly another bug affected 4.2/4.3 kernels.