LIBGL_DEBUG=verbose glxinfo|grep vendor
libGL: XF86DRIGetClientDriverName: 1.7.4 i915 (screen 0)
libGL: OpenDriver: trying /usr/lib/xorg/modules/dri/tls/i915_dri.so
libGL: OpenDriver: trying /usr/lib/xorg/modules/dri/i915_dri.so
drmOpenDevice: node name is /dev/dri/card0
drmOpenDevice: open result is 4, (OK)
drmOpenByBusid: Searching for BusID pci:0000:00:02.0
drmOpenDevice: node name is /dev/dri/card0
drmOpenDevice: open result is 4, (OK)
drmOpenByBusid: drmOpenMinor returns 4
drmOpenByBusid: drmGetBusid reports pci:0000:00:02.0
libGL warning: 3D driver claims to not support visual 0x5b
libGL error: 
Can't open configuration file /etc/drirc: No such file or directory.
libGL error: 
Can't open configuration file /home/mlweber/.drirc: No such file or directory.
server glx vendor string: SGI
client glx vendor string: SGI
OpenGL vendor string: Tungsten Graphics, Inc