Whenever I launch my client when using discrete graphics (NVIDIA. See system config below), it shows me this:

OpenGL GLX context is not using direct rendering, which may cause performance problems.

Digging in a little deeper:

[~]$ LIBGL_DEBUG=verbose steam                                                 
Running Steam on ubuntu 13.04 64-bit
STEAM_RUNTIME is enabled automatically
Installing breakpad exception handler for appid(steam)/version(1374875626_client)
libGL: screen 0 does not appear to be DRI2 capable
libGL: OpenDriver: trying /usr/lib/i386-linux-gnu/dri/tls/swrast_dri.so
libGL: OpenDriver: trying /usr/lib/i386-linux-gnu/dri/swrast_dri.so
libGL error: failed to load driver: swrast

My suspicious is that steam is not getting the PATH correctly. I've tried to set a bunch of stuff (like exporting /usr/lib32) but none of these had any effects.

System info:

Processor Information:
    Vendor:  GenuineIntel
    Speed: 2801 Mhz
    8 logical processors
    4 physical processors
    HyperThreading:  Supported
    FCMOV:  Supported
    SSE2:  Supported
    SSE3:  Supported
    SSSE3:  Supported
    SSE4a:  Unsupported
    SSE41:  Supported
    SSE42:  Supported

Network Information:
    Network Speed:  

Operating System Version:
    Ubuntu 13.04 (64 bit)
    Kernel Name:  Linux
    Kernel Version:  3.8.0-27-generic
    X Server Vendor:  The X.Org Foundation
    X Server Release:  11303000
    X Window Manager:  Xfwm4
    Steam Runtime Version:  steam-runtime-release-i386_2013-06-28

Video Card:
    Driver:  NVIDIA Corporation Quadro K1000M/PCIe/SSE2

    Driver Version:  1.4 (2.1.2 NVIDIA 310.44)
    Desktop Color Depth: 24 bits per pixel
    Monitor Refresh Rate: 60 Hz
    VendorID:  0x10de
    DeviceID:  0xffc
    Number of Monitors:  3
    Number of Logical Video Cards:  1
    Primary Display Resolution:  1920 x 1080
    Desktop Resolution: 5760 x 1320
    Primary Display Size: 13.54" x 7.60"  (15.51" diag)
                                            34.4cm x 19.3cm  (39.4cm diag)
    Primary Bus: PCI Express 16x
    Primary VRAM Not Detected
    Supported MSAA Modes:  2x 4x 8x 16x 

Sound card:
    Audio device: Realtek ALC269VC

Memory:
    RAM:  15689 Mb

Miscellaneous:
    UI Language:  English
    LANG:  en_US.UTF-8
    Microphone:  Not set
    Total Hard Disk Space Available:  464603 Mb
    Largest Free Hard Disk Block:  211479 Mb

Installed software:

Recent Failure Reports:

glxinfo:

[~]$ glxinfo                                        
name of display: :0.0
display: :0  screen: 0
direct rendering: Yes
server glx vendor string: NVIDIA Corporation
server glx version string: 1.4
server glx extensions:
    GLX_EXT_visual_info, GLX_EXT_visual_rating, GLX_SGIX_fbconfig, 
    GLX_SGIX_pbuffer, GLX_SGI_video_sync, GLX_SGI_swap_control, 
    GLX_EXT_swap_control, GLX_EXT_swap_control_tear, 
    GLX_EXT_texture_from_pixmap, GLX_ARB_create_context, 
    GLX_ARB_create_context_profile, GLX_EXT_create_context_es_profile, 
    GLX_EXT_create_context_es2_profile, GLX_ARB_create_context_robustness, 
    GLX_ARB_multisample, GLX_NV_float_buffer, GLX_ARB_fbconfig_float, 
    GLX_NV_swap_group, GLX_EXT_framebuffer_sRGB, GLX_NV_multisample_coverage, 
    GLX_NV_copy_image, GLX_NV_video_capture
client glx vendor string: NVIDIA Corporation
client glx version string: 1.4
client glx extensions:
    GLX_ARB_get_proc_address, GLX_ARB_multisample, GLX_EXT_visual_info, 
    GLX_EXT_visual_rating, GLX_EXT_import_context, GLX_SGI_video_sync, 
    GLX_NV_swap_group, GLX_NV_video_out, GLX_SGIX_fbconfig, GLX_SGIX_pbuffer, 
    GLX_SGI_swap_control, GLX_EXT_swap_control, GLX_EXT_swap_control_tear, 
    GLX_ARB_create_context, GLX_ARB_create_context_profile, 
    GLX_NV_float_buffer, GLX_ARB_fbconfig_float, 
    GLX_EXT_fbconfig_packed_float, GLX_EXT_texture_from_pixmap, 
    GLX_EXT_framebuffer_sRGB, GLX_NV_present_video, GLX_NV_copy_image, 
    GLX_NV_multisample_coverage, GLX_NV_video_capture, 
    GLX_EXT_create_context_es_profile, GLX_EXT_create_context_es2_profile, 
    GLX_ARB_create_context_robustness
GLX version: 1.4
GLX extensions:
    GLX_EXT_visual_info, GLX_EXT_visual_rating, GLX_SGIX_fbconfig, 
    GLX_SGIX_pbuffer, GLX_SGI_video_sync, GLX_SGI_swap_control, 
    GLX_EXT_swap_control, GLX_EXT_swap_control_tear, 
    GLX_EXT_texture_from_pixmap, GLX_ARB_create_context, 
    GLX_ARB_create_context_profile, GLX_EXT_create_context_es_profile, 
    GLX_EXT_create_context_es2_profile, GLX_ARB_create_context_robustness, 
    GLX_ARB_multisample, GLX_NV_float_buffer, GLX_ARB_fbconfig_float, 
    GLX_NV_swap_group, GLX_EXT_framebuffer_sRGB, GLX_NV_multisample_coverage, 
    GLX_NV_copy_image, GLX_NV_video_capture, GLX_ARB_get_proc_address
OpenGL vendor string: NVIDIA Corporation
OpenGL renderer string: Quadro K1000M/PCIe/SSE2
OpenGL version string: 4.3.0 NVIDIA 310.44
OpenGL shading language version string: 4.30 NVIDIA via Cg compiler