voila ce que me donne glxinfo et mon fichier XF86congig-4
 
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***********************************************
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Section "Module"
 
# This loads the DBE extension module.
    Load	"dbe"
 
# This loads the Video for Linux module.
    Load        "v4l"
 
    Load	"glx"
    #Load	"dri"
 
 
# This loads the miscellaneous extensions module, and disables
# initialisation of the XFree86-DGA extension within that module.
 
    SubSection	"extmod"
 #Option	"omit xfree86-dga"
    EndSubSection
 
# This loads the Type1 and FreeType font modules
 
    Load	"type1"
    Load	"freetype"
EndSection
 
 
#Section "DRI"
#    Mode	0666
#EndSection
 
# **********************************************************************
# Graphics device section
# **********************************************************************
 
Section "Device"
    Identifier "Generic VGA"
    Driver     "vga"
EndSection
 
Section "Device"
    Identifier  "Geforce 4Ti"
    VendorName  "Unknown"
    BoardName   "Unknown"
    Driver      "nvidia"
#    VideoRam    16384
    # Clock lines
 
 
    # Uncomment following option if you see a big white block        
    # instead of the cursor!                                          
    #    Option      "sw_cursor"
 
    Option      "AGPMode"  "2"
    Option      "DPMS"  "on"
EndSection
 
 
 
------------------------------------------------
************************************************
------------------------------------------------
 
 
 
$ glxinfo
name of display: :0.0
display: :0  screen: 0
direct rendering: Yes
server glx vendor string: NVIDIA Corporation
server glx version string: 1.2
server glx extensions:
    GLX_EXT_visual_info, GLX_EXT_visual_rating, GLX_SGIX_fbconfig,
    GLX_SGIX_pbuffer, GLX_ARB_multisample
client glx vendor string: NVIDIA Corporation
client glx version string: 1.2
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_SGIX_swap_group, GLX_SGIX_swap_barrier, GLX_SGIX_fbconfig,
    GLX_SGIX_pbuffer
GLX extensions:
    GLX_EXT_visual_info, GLX_EXT_visual_rating, GLX_SGIX_fbconfig,
    GLX_SGIX_pbuffer, GLX_ARB_multisample, GLX_ARB_get_proc_address
OpenGL vendor string: NVIDIA Corporation
OpenGL renderer string: GeForce4 Ti 4200/AGP/3DNOW!
OpenGL version string: 1.3.1 NVIDIA 29.60
OpenGL extensions:
    GL_ARB_imaging, GL_ARB_multisample, GL_ARB_multitexture,
    GL_ARB_texture_border_clamp, GL_ARB_texture_compression,
    GL_ARB_texture_cube_map, GL_ARB_texture_env_add,
    GL_ARB_texture_env_combine, GL_ARB_texture_env_dot3,
    GL_ARB_transpose_matrix, GL_S3_s3tc, GL_EXT_abgr, GL_EXT_bgra,
    GL_EXT_blend_color, GL_EXT_blend_minmax, GL_EXT_blend_subtract,
    GL_EXT_compiled_vertex_array, GL_EXT_draw_range_elements,
    GL_EXT_fog_coord, GL_EXT_multi_draw_arrays, GL_EXT_packed_pixels,
    GL_EXT_paletted_texture, GL_EXT_point_parameters, GL_EXT_rescale_normal,
    GL_EXT_secondary_color, GL_EXT_separate_specular_color,
    GL_EXT_shared_texture_palette, GL_EXT_stencil_wrap, GL_EXT_texture3D,
    GL_EXT_texture_compression_s3tc, GL_EXT_texture_edge_clamp,
    GL_EXT_texture_env_add, GL_EXT_texture_env_combine,
    GL_EXT_texture_env_dot3, GL_EXT_texture_cube_map,
    GL_EXT_texture_filter_anisotropic, GL_EXT_texture_lod,
    GL_EXT_texture_lod_bias, GL_EXT_texture_object, GL_EXT_vertex_array,
    GL_EXT_vertex_weighting, GL_HP_occlusion_test,
    GL_IBM_texture_mirrored_repeat, GL_KTX_buffer_region, GL_NV_blend_square,
    GL_NV_copy_depth_to_color, GL_NV_evaluators, GL_NV_fence,
    GL_NV_fog_distance, GL_NV_light_max_exponent,
    GL_NV_multisample_filter_hint, GL_NV_occlusion_query,
    GL_NV_packed_depth_stencil, GL_NV_point_sprite, GL_NV_register_combiners,
    GL_NV_register_combiners2, GL_NV_texgen_reflection,
    GL_NV_texture_compression_vtc, GL_NV_texture_env_combine4,
    GL_NV_texture_rectangle, GL_NV_texture_shader, GL_NV_texture_shader2,
    GL_NV_texture_shader3, GL_NV_vertex_array_range,
    GL_NV_vertex_array_range2, GL_NV_vertex_program, GL_NV_vertex_program1_1,
    GL_SGIS_generate_mipmap, GL_SGIS_multitexture, GL_SGIS_texture_lod,
    GL_SGIX_depth_texture, GL_SGIX_shadow
glu version: 1.3
glu extensions:
    GLU_EXT_nurbs_tessellator, GLU_EXT_object_space_tess
 
   visual  x  bf lv rg d st colorbuffer ax dp st accumbuffer  ms  cav
 id dep cl sp sz l  ci b ro  r  g  b  a bf th cl  r  g  b  a ns b eat
----------------------------------------------------------------------
0x21 16 tc  0 16  0 r  y  .  5  6  5  0  0 16  0 16 16 16 16  0 0 None
0x22 16 dc  0 16  0 r  y  .  5  6  5  0  0 16  0 16 16 16 16  0 0 None
0x23 16 tc  0 16  0 r  .  .  5  6  5  0  0 16  0 16 16 16 16  0 0 None
0x24 16 tc  0 16  0 r  y  .  5  6  5  0  0 24  8 16 16 16 16  0 0 None
0x25 16 tc  0 16  0 r  .  .  5  6  5  0  0 24  8 16 16 16 16  0 0 None
0x26 16 tc  0 16  0 r  y  .  5  6  5  0  0 16  0 16 16 16 16  0 0 Ncon
0x27 16 tc  0 16  0 r  y  .  5  6  5  0  0 24  8 16 16 16 16  0 0 Ncon
0x28 16 tc  0 16  0 r  y  .  5  6  5  0  0 16  0 16 16 16 16  0 0 Ncon
0x29 16 tc  0 16  0 r  y  .  5  6  5  0  0 24  8 16 16 16 16  0 0 Ncon
0x2a 16 dc  0 16  0 r  .  .  5  6  5  0  0 16  0 16 16 16 16  0 0 None
0x2b 16 dc  0 16  0 r  y  .  5  6  5  0  0 24  8 16 16 16 16  0 0 None
0x2c 16 dc  0 16  0 r  .  .  5  6  5  0  0 24  8 16 16 16 16  0 0 None
0x2d 16 dc  0 16  0 r  y  .  5  6  5  0  0 16  0 16 16 16 16  0 0 Ncon
0x2e 16 dc  0 16  0 r  y  .  5  6  5  0  0 24  8 16 16 16 16  0 0 Ncon
0x2f 16 dc  0 16  0 r  y  .  5  6  5  0  0 16  0 16 16 16 16  0 0 Ncon
0x30 16 dc  0 16  0 r  y  .  5  6  5  0  0 24  8 16 16 16 16  0 0 Ncon