$ env LIBGL_DEBUG=verbose glxgears
libGL: Can't open configuration file /usr/local/etc/drirc: No such file or directory.
libGL: Can't open configuration file /home/adrian/.drirc: No such file or directory.
using driver i915 for 4
libGL: Can't open configuration file /usr/local/etc/drirc: No such file or directory.
libGL: Can't open configuration file /home/adrian/.drirc: No such file or directory.
pci id for fd 4: 8086:0416, driver crocus
MESA-LOADER: dlopen(/usr/local/lib/dri/crocus_dri.so)
libGL: Can't open configuration file /usr/local/etc/drirc: No such file or directory.
libGL: Can't open configuration file /home/adrian/.drirc: No such file or directory.
libGL: Can't open configuration file /usr/local/etc/drirc: No such file or directory.
libGL: Can't open configuration file /home/adrian/.drirc: No such file or directory.
libGL: Can't open configuration file /usr/local/etc/drirc: No such file or directory.
libGL: Can't open configuration file /home/adrian/.drirc: No such file or directory.
Using DRI3 for screen 0
XIO:  fatal IO error 45 (Operation not supported) on X server ":0.0"
      after 37 requests (37 known processed) with 0 events remaining.