assad@assad-HP-Notebook:~$ export DRI_PRIME=1 ; glxinfo |egrep -i "opengl vendor|opengl renderer"

OpenGL vendor string: X.Org
OpenGL renderer string: Gallium 0.4 on AMD ICELAND (DRM 3.1.0 / 4.4.0-101-generic, LLVM 4.0.0)