$ LIBGL_DEBUG=verbose glxgears 2>&1
libGL: XF86DRIGetClientDriverName: 1.8.0 i915tex (screen 0)
libGL: OpenDriver: trying
/usr/local/X11R7.3/lib/xorg/modules/dri/i915tex_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 0x74
libGL error: 
Can't open configuration file /etc/drirc: No such file or directory.
libGL error: 
Can't open configuration file /home/xhejtman/.drirc: No such file or
directory.
1038 frames in 5.0 seconds = 207.425 FPS