Comment # 10 on bug 93017 from polo

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.