[raph@doorsman ~]$ glxinfo | grep direct 
libGL error: open DRM failed (Operation not permitted)
libGL error: reverting to (slow) indirect rendering
direct rendering: No (If you want to find out why, try setting LIBGL_DEBUG=verbose)
[raph@doorsman ~]$ su
Mot de passe : 
[root@doorsman raph]# 
[root@doorsman raph]# glxinfo | grep direct 
libGL warning: 3D driver claims to not support visual 0x4c
direct rendering: Yes
[root@doorsman raph]#