(In reply to Pablo Estigarribia from comment #7)
> I have tried now two more combinations (in /etc/environment to stabilize
> gnome session):
> 
> MESA_GL_VERSION_OVERRIDE=3.0
> MESA_GL_VERSION_OVERRIDE=3.1 
> 
> Up to GL 3.0, everything works fine and stable, glmark2 and gnome session. 
> 
> With 3.1 or any other higher glmark2 shows only black content on the window
> opened when I use MESA_GL_VERSION_OVERRIDE=3.1 glmark2 in same session that
> I openned using /etc/environment. 
> 
> If I change to: 
> 
> MESA_GL_VERSION_OVERRIDE=3.1 in /etc/environment, then also gnome session
> (after login in gdm) got "gdm background" with screen freezed video.

after new tests I got error also with 3.0, still doing more tests.