LIBGL_ALWAYS_INDIRECT causes glxinfo failed on local machine

I am playing with OpenGL environment variables. I tried with indirect rendering but it generates the following error:

name of display: :0
X Error of failed request:  GLXBadContext
  Major opcode of failed request:  154 (GLX)
  Minor opcode of failed request:  6 (X_GLXIsDirect)
  Serial number of failed request:  34
  Current serial number in output stream:  33

glxinfoworks fine without setting LIBGL_ALWAYS_INDIRECT.

$ glxinfo
name of display: :0
display: :0  screen: 0
direct rendering: Yes
server glx vendor string: SGI
server glx version string: 1.4
client glx vendor string: Mesa Project and SGI
client glx version string: 1.4
GLX version: 1.4
Extended renderer info (GLX_MESA_query_renderer):
    Vendor: nouveau (0x10de)
    Device: NVE7 (0xffa)
    Version: 11.2.2
    Accelerated: yes
OpenGL vendor string: nouveau
OpenGL renderer string: Gallium 0.4 on NVE7
OpenGL core profile version string: 4.1 (Core Profile) Mesa 11.2.2
OpenGL version string: 3.0 Mesa 11.2.2
OpenGL shading language version string: 1.30
OpenGL context flags: (none)

I tried both commands on another Linux computer and both work. It seems that the first computer has some setting that prevents it from using indirect rendering. What it is?

Found this link which answers my question, plus a lot of useful information

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