ATI HD 2600

вывод glxinfo на ЛОР.

Нет.
У меня даже на HD2400 ~240fps

splinter@bastilie:~$ glxinfo
name of display: :0.0
display: :0  screen: 0
direct rendering: Yes
server glx vendor string: SGI
server glx version string: 1.2
server glx extensions:
    GLX_ARB_multisample, GLX_EXT_import_context, GLX_EXT_texture_from_pixmap,
    GLX_EXT_visual_info, GLX_EXT_visual_rating, GLX_OML_swap_method,
    GLX_SGIS_multisample, GLX_SGIX_fbconfig, GLX_SGIX_visual_select_group
client glx vendor string: SGI
client glx version string: 1.4
client glx extensions:
    GLX_ARB_get_proc_address, GLX_ARB_multisample, GLX_EXT_import_context,
    GLX_EXT_visual_info, GLX_EXT_visual_rating, GLX_MESA_allocate_memory,
    GLX_MESA_swap_control, GLX_MESA_swap_frame_usage, 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 version: 1.2
GLX extensions:
    GLX_ARB_get_proc_address, GLX_ARB_multisample, GLX_EXT_import_context,
    GLX_EXT_visual_info, GLX_EXT_visual_rating, GLX_OML_swap_method,
    GLX_SGIS_multisample, GLX_SGIX_fbconfig, GLX_SGIX_visual_select_group
OpenGL vendor string: ATI Technologies Inc.
OpenGL renderer string: ATI Radeon HD 2600 XT
OpenGL version string: 2.1.8087 Release
OpenGL extensions:
    GL_AMDX_vertex_shader_tessellator, GL_AMD_performance_monitor,
    GL_ARB_color_buffer_float, GL_ARB_depth_texture, GL_ARB_draw_buffers,
    GL_ARB_draw_instanced, GL_ARB_fragment_program, GL_ARB_fragment_shader,
    GL_ARB_half_float_pixel, GL_ARB_half_float_vertex,
    GL_ARB_instanced_arrays, GL_ARB_multisample, GL_ARB_multitexture,
    GL_ARB_occlusion_query, GL_ARB_pixel_buffer_object,
    GL_ARB_point_parameters, GL_ARB_point_sprite, GL_ARB_shader_objects,
    GL_ARB_shader_texture_lod, GL_ARB_shading_language_100, GL_ARB_shadow,
    GL_ARB_shadow_ambient, 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_crossbar, GL_ARB_texture_env_dot3,
    GL_ARB_texture_float, GL_ARB_texture_mirrored_repeat,
    GL_ARB_texture_non_power_of_two, GL_ARB_texture_rectangle,
    GL_ARB_transpose_matrix, GL_ARB_vertex_buffer_object,
    GL_ARB_vertex_program, GL_ARB_vertex_shader, GL_ARB_window_pos,
    GL_ATI_draw_buffers, GL_ATI_envmap_bumpmap, GL_ATI_fragment_shader,
    GL_ATI_meminfo, GL_ATI_separate_stencil, GL_ATI_texture_compression_3dc,
    GL_ATI_texture_env_combine3, GL_ATI_texture_float, GL_EXT_abgr,
    GL_EXT_bgra, GL_EXT_blend_color, GL_EXT_blend_equation_separate,
    GL_EXT_blend_func_separate, GL_EXT_blend_minmax, GL_EXT_blend_subtract,
    GL_EXT_compiled_vertex_array, GL_EXT_copy_texture,
    GL_EXT_depth_buffer_float, GL_EXT_draw_range_elements, GL_EXT_fog_coord,
    GL_EXT_framebuffer_blit, GL_EXT_framebuffer_multisample,
    GL_EXT_framebuffer_object, GL_EXT_gpu_program_parameters,
    GL_EXT_gpu_shader4, GL_EXT_multi_draw_arrays, GL_EXT_packed_depth_stencil,
    GL_EXT_packed_float, GL_EXT_packed_pixels, GL_EXT_point_parameters,
    GL_EXT_rescale_normal, GL_EXT_secondary_color,
    GL_EXT_separate_specular_color, GL_EXT_shadow_funcs, GL_EXT_stencil_wrap,
    GL_EXT_subtexture, GL_EXT_texgen_reflection, GL_EXT_texture3D,
    GL_EXT_texture_compression_latc, GL_EXT_texture_compression_rgtc,
    GL_EXT_texture_compression_s3tc, GL_EXT_texture_cube_map,
    GL_EXT_texture_edge_clamp, GL_EXT_texture_env_add,
    GL_EXT_texture_env_combine, GL_EXT_texture_env_dot3,
    GL_EXT_texture_filter_anisotropic, GL_EXT_texture_lod_bias,
    GL_EXT_texture_mirror_clamp, GL_EXT_texture_object,
    GL_EXT_texture_rectangle, GL_EXT_texture_sRGB,
    GL_EXT_texture_shared_exponent, GL_EXT_vertex_array, GL_KTX_buffer_region,
    GL_NV_blend_square, GL_NV_texgen_reflection, GL_SGIS_generate_mipmap,
    GL_SGIS_texture_edge_clamp, GL_SGIS_texture_l

Весь наверное не стоит выводить :)

fglrxinfo display: :0.0 screen: 0 OpenGL vendor string: ATI Technologies Inc. OpenGL renderer string: ATI Radeon HD 2600 XT OpenGL version string: 2.1.8087 Release

75 fps, а частота монитора случайно не 75 Hz ? Тогда это vsync виноват

да 75, но как бы монитор ЖК, частота не принципиальна. Советуешь поменять?

>да 75, но как бы монитор ЖК, частота не принципиальна. Советуешь поменять

Смысла нет менять, все тогда ОК, работает. Скачай Lightsmark 2008 и нормально проверь как работает.

http://www.linux.org.ru/view-message.jsp?msgid=2999115

Специально для Ъ ссылку дал ЛОРовскую.

>частота не принципиальна

Я бы сказал не совсем так.