It may be my setup mistake, but glxinfo shows llvmpipe renderer instead of nouveau when launched from user account different from that which has X session running. Launching from root shows correct info.

Steps to reproduce:

# useradd llvmtest

# xhost +local:

# sudo -u llvmtest glxinfo | grep -E 'OpenGL (vendor|renderer)'
OpenGL vendor string: VMware, Inc.
OpenGL renderer string: Gallium 0.4 on llvmpipe

# xhost -local:


Correct info:
OpenGL vendor string: nouveau
OpenGL renderer string: Gallium 0.4 on NV43

xorg.conf absent, just mouse and keyboard config files are present.

Video: 01:00.0 VGA compatible controller [0300]: nVidia Corporation NV43 [GeForce 6600] [10de:0141] (rev a2)