dan@wks:~$ fglrxinfo
display: :0.0  screen: 0
OpenGL vendor string: Mesa project: www.mesa3d.org
OpenGL renderer string: Mesa GLX Indirect
OpenGL version string: 1.2 (1.5 Mesa 6.4.2)

dan@wks:~$ fgl_glxgears
Using GLX_SGIX_pbuffer
X Error of failed request:  BadMatch (invalid parameter attributes)
  Major opcode of failed request:  143 (GLX)
  Minor opcode of failed request:  5 (X_GLXMakeCurrent)
  Serial number of failed request:  32
  Current serial number in output stream:  32