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I typed glxinfo and what it says :

name of display: :0
display: :0  screen: 0
direct rendering: Yes
server glx vendor string: SGI
server glx version string: 1.4
server glx extensions:
    GLX_ARB_multisample, GLX_EXT_import_context, GLX_EXT_texture_from_pixmap, 
    GLX_EXT_visual_info, GLX_EXT_visual_rating, GLX_MESA_copy_sub_buffer, 
    GLX_OML_swap_method, GLX_SGI_swap_control, GLX_SGIS_multisample, 
    GLX_SGIX_fbconfig, GLX_SGIX_pbuffer, GLX_SGIX_visual_select_group, 
    GLX_INTEL_swap_event
client glx vendor string: Mesa Project and SGI
client glx version string: 1.4
client glx extensions:
    GLX_ARB_create_context, GLX_ARB_create_context_profile, 
    GLX_ARB_get_proc_address, GLX_ARB_multisample, GLX_EXT_import_context, 
    GLX_EXT_visual_info, GLX_EXT_visual_rating, GLX_EXT_framebuffer_sRGB, 
    GLX_EXT_create_context_es2_profile, GLX_MESA_copy_sub_buffer, 
    GLX_MESA_multithread_makecurrent, GLX_MESA_swap_control, 
    GLX_OML_swap_method, GLX_OML_sync_control, GLX_SGI_make_current_read, 
    GLX_SGI_swap_control, GLX_SGI_video_sync, GLX_SGIS_multisample, 
    GLX_SGIX_fbconfig, GLX_SGIX_pbuffer, GLX_SGIX_visual_select_group, 
    GLX_EXT_texture_from_pixmap, GLX_INTEL_swap_event
GLX version: 1.4
GLX extensions:
    GLX_ARB_get_proc_address, GLX_ARB_multisample, GLX_EXT_import_context, 
    GLX_EXT_visual_info, GLX_EXT_visual_rating, GLX_MESA_copy_sub_buffer, 
    GLX_MESA_multithread_makecurrent, GLX_MESA_swap_control, 
    GLX_OML_swap_method, GLX_OML_sync_control, GLX_SGI_make_current_read, 
    GLX_SGI_swap_control, GLX_SGI_video_sync, GLX_SGIS_multisample, 
    GLX_SGIX_fbconfig, GLX_SGIX_pbuffer, GLX_SGIX_visual_select_group, 
    GLX_EXT_texture_from_pixmap
OpenGL vendor string: Tungsten Graphics, Inc
OpenGL renderer string: Mesa DRI Intel(R) Ivybridge Mobile 
OpenGL version string: 3.0 Mesa 8.0.4
OpenGL shading language version string: 1.30
OpenGL extensions:
    GL_ARB_multisample, GL_EXT_abgr, GL_EXT_bgra, GL_EXT_blend_color, 
    GL_EXT_blend_minmax, GL_EXT_blend_subtract, GL_EXT_copy_texture, 
    GL_EXT_polygon_offset, GL_EXT_subtexture, GL_EXT_texture_object, 
    GL_EXT_vertex_array, GL_EXT_compiled_vertex_array, GL_EXT_texture, 
    GL_EXT_texture3D, GL_IBM_rasterpos_clip, GL_ARB_point_parameters, 
    GL_EXT_draw_range_elements, GL_EXT_packed_pixels, GL_EXT_point_parameters, 
    GL_EXT_rescale_normal, GL_EXT_separate_specular_color, 
    GL_EXT_texture_edge_clamp, GL_SGIS_generate_mipmap, 
    GL_SGIS_texture_border_clamp, GL_SGIS_texture_edge_clamp, 
    GL_SGIS_texture_lod, GL_ARB_framebuffer_sRGB, GL_ARB_multitexture, 
    GL_EXT_framebuffer_sRGB, GL_IBM_multimode_draw_arrays, 
    GL_IBM_texture_mirrored_repeat, GL_3DFX_texture_compression_FXT1, 
    GL_ARB_texture_cube_map, GL_ARB_texture_env_add, GL_ARB_transpose_matrix, 
    GL_EXT_blend_func_separate, GL_EXT_fog_coord, GL_EXT_multi_draw_arrays, 
    GL_EXT_secondary_color, GL_EXT_texture_env_add, 
    GL_EXT_texture_filter_anisotropic, GL_EXT_texture_lod_bias, 
    GL_INGR_blend_func_separate, GL_NV_blend_square, GL_NV_light_max_exponent, 
    GL_NV_texgen_reflection, GL_NV_texture_env_combine4, 
    GL_SUN_multi_draw_arrays, GL_ARB_texture_border_clamp, 
    GL_ARB_texture_compression, GL_EXT_framebuffer_object, 
    GL_EXT_texture_env_combine, GL_EXT_texture_env_dot3, GL_MESA_window_pos, 
    GL_NV_packed_depth_stencil, GL_NV_texture_rectangle, GL_NV_vertex_program, 
    GL_ARB_depth_texture, GL_ARB_occlusion_query, GL_ARB_shadow, 
    GL_ARB_texture_env_combine, GL_ARB_texture_env_crossbar, 
    GL_ARB_texture_env_dot3, GL_ARB_texture_mirrored_repeat, 
    GL_ARB_window_pos, GL_ATI_envmap_bumpmap, GL_EXT_stencil_two_side, 
    GL_EXT_texture_cube_map, GL_NV_depth_clamp, GL_NV_vertex_program1_1, 
    GL_APPLE_packed_pixels, GL_APPLE_vertex_array_object, GL_ARB_draw_buffers, 
    GL_ARB_fragment_program, GL_ARB_fragment_shader, GL_ARB_shader_objects, 
    GL_ARB_vertex_program, GL_ARB_vertex_shader, GL_ATI_draw_buffers, 
    GL_ATI_texture_env_combine3, GL_ATI_texture_float, GL_EXT_shadow_funcs, 
    GL_EXT_stencil_wrap, GL_MESA_pack_invert, GL_MESA_ycbcr_texture, 
    GL_ARB_depth_clamp, GL_ARB_fragment_program_shadow, 
    GL_ARB_half_float_pixel, GL_ARB_point_sprite, GL_ARB_shading_language_100, 
    GL_ARB_sync, GL_ARB_texture_non_power_of_two, GL_ARB_vertex_buffer_object, 
    GL_ATI_blend_equation_separate, GL_EXT_blend_equation_separate, 
    GL_OES_read_format, GL_ARB_color_buffer_float, GL_ARB_pixel_buffer_object, 
    GL_ARB_texture_compression_rgtc, GL_ARB_texture_float, 
    GL_ARB_texture_rectangle, GL_EXT_packed_float, GL_EXT_pixel_buffer_object, 
    GL_EXT_texture_compression_rgtc, GL_EXT_texture_rectangle, 
    GL_EXT_texture_sRGB, GL_EXT_texture_shared_exponent, 
    GL_ARB_framebuffer_object, GL_EXT_framebuffer_blit, 
    GL_EXT_framebuffer_multisample, GL_EXT_packed_depth_stencil, 
    GL_APPLE_object_purgeable, GL_ARB_vertex_array_object, 
    GL_ATI_separate_stencil, GL_EXT_draw_buffers2, 
    GL_EXT_gpu_program_parameters, GL_EXT_texture_array, 
    GL_EXT_texture_integer, GL_EXT_texture_sRGB_decode, GL_EXT_timer_query, 
    GL_OES_EGL_image, GL_MESA_texture_array, GL_ARB_copy_buffer, 
    GL_ARB_depth_buffer_float, GL_ARB_half_float_vertex, 
    GL_ARB_map_buffer_range, GL_ARB_texture_rg, GL_ARB_texture_swizzle, 
    GL_ARB_vertex_array_bgra, GL_EXT_separate_shader_objects, 
    GL_EXT_texture_swizzle, GL_EXT_vertex_array_bgra, 
    GL_NV_conditional_render, GL_ARB_ES2_compatibility, 
    GL_ARB_draw_elements_base_vertex, GL_ARB_explicit_attrib_location, 
    GL_ARB_fragment_coord_conventions, GL_ARB_provoking_vertex, 
    GL_ARB_sampler_objects, GL_ARB_seamless_cube_map, 
    GL_ARB_shader_texture_lod, GL_EXT_provoking_vertex, GL_EXT_texture_snorm, 
    GL_MESA_texture_signed_rgba, GL_ARB_robustness, GL_EXT_transform_feedback

32 GLX Visuals
    visual  x   bf lv rg d st  colorbuffer  sr ax dp st accumbuffer  ms  cav
  id dep cl sp  sz l  ci b ro  r  g  b  a F gb bf th cl  r  g  b  a ns b eat
----------------------------------------------------------------------------
0x021 24 tc  0  32  0 r  y .   8  8  8  8 .  .  0 24  8  0  0  0  0  0 0 None
0x022 24 dc  0  32  0 r  y .   8  8  8  8 .  .  0 24  8  0  0  0  0  0 0 None
0x091 24 tc  0  24  0 r  . .   8  8  8  0 .  .  0  0  0  0  0  0  0  0 0 None
0x092 24 tc  0  24  0 r  y .   8  8  8  0 .  .  0  0  0  0  0  0  0  0 0 None
0x093 24 tc  0  24  0 r  y .   8  8  8  0 .  .  0  0  0  0  0  0  0  0 0 None
0x094 24 tc  0  24  0 r  . .   8  8  8  0 .  .  0 24  8  0  0  0  0  0 0 None
0x095 24 tc  0  24  0 r  y .   8  8  8  0 .  .  0 24  8  0  0  0  0  0 0 None
0x096 24 tc  0  24  0 r  y .   8  8  8  0 .  .  0 24  8  0  0  0  0  0 0 None
0x097 24 tc  0  32  0 r  . .   8  8  8  8 .  .  0  0  0  0  0  0  0  0 0 None
0x098 24 tc  0  32  0 r  y .   8  8  8  8 .  .  0  0  0  0  0  0  0  0 0 None
0x099 24 tc  0  32  0 r  y .   8  8  8  8 .  .  0  0  0  0  0  0  0  0 0 None
0x09a 24 tc  0  32  0 r  . .   8  8  8  8 .  .  0 24  8  0  0  0  0  0 0 None
0x09b 24 tc  0  24  0 r  y .   8  8  8  0 .  .  0 24  8  0  0  0  0  0 0 None
0x09c 24 tc  0  24  0 r  y .   8  8  8  0 .  .  0 24  8 16 16 16  0  0 0 Slow
0x09d 24 tc  0  32  0 r  y .   8  8  8  8 .  .  0 24  8  0  0  0  0  0 0 None
0x09e 24 tc  0  32  0 r  y .   8  8  8  8 .  .  0 24  8 16 16 16 16  0 0 Slow
0x09f 24 dc  0  24  0 r  . .   8  8  8  0 .  .  0  0  0  0  0  0  0  0 0 None
0x0a0 24 dc  0  24  0 r  y .   8  8  8  0 .  .  0  0  0  0  0  0  0  0 0 None
0x0a1 24 dc  0  24  0 r  y .   8  8  8  0 .  .  0  0  0  0  0  0  0  0 0 None
0x0a2 24 dc  0  24  0 r  . .   8  8  8  0 .  .  0 24  8  0  0  0  0  0 0 None
0x0a3 24 dc  0  24  0 r  y .   8  8  8  0 .  .  0 24  8  0  0  0  0  0 0 None
0x0a4 24 dc  0  24  0 r  y .   8  8  8  0 .  .  0 24  8  0  0  0  0  0 0 None
0x0a5 24 dc  0  32  0 r  . .   8  8  8  8 .  .  0  0  0  0  0  0  0  0 0 None
0x0a6 24 dc  0  32  0 r  y .   8  8  8  8 .  .  0  0  0  0  0  0  0  0 0 None
0x0a7 24 dc  0  32  0 r  y .   8  8  8  8 .  .  0  0  0  0  0  0  0  0 0 None
0x0a8 24 dc  0  32  0 r  . .   8  8  8  8 .  .  0 24  8  0  0  0  0  0 0 None
0x0a9 24 dc  0  32  0 r  y .   8  8  8  8 .  .  0 24  8  0  0  0  0  0 0 None
0x0aa 24 dc  0  24  0 r  y .   8  8  8  0 .  .  0 24  8  0  0  0  0  0 0 None
0x0ab 24 dc  0  24  0 r  y .   8  8  8  0 .  .  0 24  8 16 16 16  0  0 0 Slow
0x0ac 24 dc  0  32  0 r  y .   8  8  8  8 .  .  0 24  8  0  0  0  0  0 0 None
0x0ad 24 dc  0  32  0 r  y .   8  8  8  8 .  .  0 24  8 16 16 16 16  0 0 Slow
0x060 32 tc  0  32  0 r  y .   8  8  8  8 .  .  0 24  8  0  0  0  0  0 0 None

48 GLXFBConfigs:
    visual  x   bf lv rg d st  colorbuffer  sr ax dp st accumbuffer  ms  cav
  id dep cl sp  sz l  ci b ro  r  g  b  a F gb bf th cl  r  g  b  a ns b eat
----------------------------------------------------------------------------
0x061  0 tc  0  16  0 r  . .   5  6  5  0 .  .  0  0  0  0  0  0  0  0 0 None
0x062  0 tc  0  16  0 r  y .   5  6  5  0 .  .  0  0  0  0  0  0  0  0 0 None
0x063  0 tc  0  16  0 r  y .   5  6  5  0 .  .  0  0  0  0  0  0  0  0 0 None
0x064  0 tc  0  16  0 r  . .   5  6  5  0 .  .  0 16  0  0  0  0  0  0 0 None
0x065  0 tc  0  16  0 r  y .   5  6  5  0 .  .  0 16  0  0  0  0  0  0 0 None
0x066  0 tc  0  16  0 r  y .   5  6  5  0 .  .  0 16  0  0  0  0  0  0 0 None
0x067 24 tc  0  24  0 r  . .   8  8  8  0 .  .  0  0  0  0  0  0  0  0 0 None
0x068 24 tc  0  24  0 r  y .   8  8  8  0 .  .  0  0  0  0  0  0  0  0 0 None
0x069 24 tc  0  24  0 r  y .   8  8  8  0 .  .  0  0  0  0  0  0  0  0 0 None
0x06a 24 tc  0  24  0 r  . .   8  8  8  0 .  .  0 24  8  0  0  0  0  0 0 None
0x06b 24 tc  0  24  0 r  y .   8  8  8  0 .  .  0 24  8  0  0  0  0  0 0 None
0x06c 24 tc  0  24  0 r  y .   8  8  8  0 .  .  0 24  8  0  0  0  0  0 0 None
0x06d 24 tc  0  32  0 r  . .   8  8  8  8 .  .  0  0  0  0  0  0  0  0 0 None
0x06e 24 tc  0  32  0 r  y .   8  8  8  8 .  .  0  0  0  0  0  0  0  0 0 None
0x06f 24 tc  0  32  0 r  y .   8  8  8  8 .  .  0  0  0  0  0  0  0  0 0 None
0x070 24 tc  0  32  0 r  . .   8  8  8  8 .  .  0 24  8  0  0  0  0  0 0 None
0x071 24 tc  0  32  0 r  y .   8  8  8  8 .  .  0 24  8  0  0  0  0  0 0 None
0x072 32 tc  0  32  0 r  y .   8  8  8  8 .  .  0 24  8  0  0  0  0  0 0 None
0x073  0 tc  0  16  0 r  y .   5  6  5  0 .  .  0 16  0  0  0  0  0  0 0 None
0x074  0 tc  0  16  0 r  y .   5  6  5  0 .  .  0 16  0 16 16 16  0  0 0 Slow
0x075 24 tc  0  24  0 r  y .   8  8  8  0 .  .  0 24  8  0  0  0  0  0 0 None
0x076 24 tc  0  24  0 r  y .   8  8  8  0 .  .  0 24  8 16 16 16  0  0 0 Slow
0x077 24 tc  0  32  0 r  y .   8  8  8  8 .  .  0 24  8  0  0  0  0  0 0 None
0x078 24 tc  0  32  0 r  y .   8  8  8  8 .  .  0 24  8 16 16 16 16  0 0 Slow
0x079  0 dc  0  16  0 r  . .   5  6  5  0 .  .  0  0  0  0  0  0  0  0 0 None
0x07a  0 dc  0  16  0 r  y .   5  6  5  0 .  .  0  0  0  0  0  0  0  0 0 None
0x07b  0 dc  0  16  0 r  y .   5  6  5  0 .  .  0  0  0  0  0  0  0  0 0 None
0x07c  0 dc  0  16  0 r  . .   5  6  5  0 .  .  0 16  0  0  0  0  0  0 0 None
0x07d  0 dc  0  16  0 r  y .   5  6  5  0 .  .  0 16  0  0  0  0  0  0 0 None
0x07e  0 dc  0  16  0 r  y .   5  6  5  0 .  .  0 16  0  0  0  0  0  0 0 None
0x07f 24 dc  0  24  0 r  . .   8  8  8  0 .  .  0  0  0  0  0  0  0  0 0 None
0x080 24 dc  0  24  0 r  y .   8  8  8  0 .  .  0  0  0  0  0  0  0  0 0 None
0x081 24 dc  0  24  0 r  y .   8  8  8  0 .  .  0  0  0  0  0  0  0  0 0 None
0x082 24 dc  0  24  0 r  . .   8  8  8  0 .  .  0 24  8  0  0  0  0  0 0 None
0x083 24 dc  0  24  0 r  y .   8  8  8  0 .  .  0 24  8  0  0  0  0  0 0 None
0x084 24 dc  0  24  0 r  y .   8  8  8  0 .  .  0 24  8  0  0  0  0  0 0 None
0x085 24 dc  0  32  0 r  . .   8  8  8  8 .  .  0  0  0  0  0  0  0  0 0 None
0x086 24 dc  0  32  0 r  y .   8  8  8  8 .  .  0  0  0  0  0  0  0  0 0 None
0x087 24 dc  0  32  0 r  y .   8  8  8  8 .  .  0  0  0  0  0  0  0  0 0 None
0x088 24 dc  0  32  0 r  . .   8  8  8  8 .  .  0 24  8  0  0  0  0  0 0 None
0x089 24 dc  0  32  0 r  y .   8  8  8  8 .  .  0 24  8  0  0  0  0  0 0 None
0x08a 24 dc  0  32  0 r  y .   8  8  8  8 .  .  0 24  8  0  0  0  0  0 0 None
0x08b  0 dc  0  16  0 r  y .   5  6  5  0 .  .  0 16  0  0  0  0  0  0 0 None
0x08c  0 dc  0  16  0 r  y .   5  6  5  0 .  .  0 16  0 16 16 16  0  0 0 Slow
0x08d 24 dc  0  24  0 r  y .   8  8  8  0 .  .  0 24  8  0  0  0  0  0 0 None
0x08e 24 dc  0  24  0 r  y .   8  8  8  0 .  .  0 24  8 16 16 16  0  0 0 Slow
0x08f 24 dc  0  32  0 r  y .   8  8  8  8 .  .  0 24  8  0  0  0  0  0 0 None
0x090 24 dc  0  32  0 r  y .   8  8  8  8 .  .  0 24  8 16 16 16 16  0 0 Slow

I wonder what the None and Slow mean..

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