ryan@rkavanagh:~$ /usr/bin/Xgl :1 -fullscreen -accel xv -accel glx:pbuffer -accel xv:pbuffer -ac -kb -audit 0 -br -dpms -dpi 72
X Error of failed request:  BadLength (poly request too large or internal Xlib length error)
  Major opcode of failed request:  143 (GLX)
  Minor opcode of failed request:  1 (X_GLXRender)
  Serial number of failed request:  96
  Current serial number in output stream:  97
ryan@rkavanagh:~$