Have managed to install the ATI drivers for my HD 2900 Pro. When I run fglrxinfo and glxinfo everything looks fine. But when I am scrolling up or down on web pages it draws very slowly. Sort of a jerky movement that I have no control over. Help its driving me crazy. On my other machine, an ATI X800, the drivers installed and run just fine!

$ fglrxinfo
display: :0.0 screen: 0
OpenGL vendor string: ATI Technologies Inc.
OpenGL renderer string: ATI Radeon HD 2900 XT
OpenGL version string: 2.0.6958 Release

$ 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_copy_sub_buffer, 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 2900 XT
OpenGL version string: 2.0.6958 Release
OpenGL extensions:
GL_ARB_depth_texture, GL_ARB_draw_buffers, GL_ARB_fragment_program,
GL_ARB_fragment_shader, GL_ARB_multisample, GL_ARB_multitexture,
GL_ARB_occlusion_query, GL_ARB_point_parameters, GL_ARB_point_sprite,
GL_ARB_shader_objects, 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_bgra,
GL_EXT_blend_color, GL_EXT_blend_func_separate, GL_EXT_blend_minmax,
GL_EXT_blend_subtract, GL_EXT_compiled_vertex_array, GL_EXT_copy_texture,
GL_EXT_draw_range_elements, GL_EXT_fog_coord, GL_EXT_framebuffer_object,
GL_EXT_framebuffer_object, GL_EXT_gpu_program_parameters,
GL_EXT_multi_draw_arrays, GL_EXT_packed_depth_stencil,
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_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_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_lod,
GL_WIN_swap_hint, WGL_EXT_swap_control

visual x bf lv rg d st colorbuffer ax dp st accumbuffer ms cav
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----------------------------------------------------------------------
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0x43 24 tc 0 32 0 r y . 8 8 8 8 0 24 8 16 16 16 16 0 0 None
0x44 24 tc 0 32 0 r . . 8 8 8 8 0 24 8 16 16 16 16 0 0 None
0x45 24 tc 0 32 0 r y . 8 8 8 8 0 24 0 16 16 16 16 0 0 None
0x46 24 tc 0 32 0 r . . 8 8 8 8 0 24 0 16 16 16 16 0 0 None
0x47 24 tc 0 32 0 r y . 8 8 8 8 0 24 8 0 0 0 0 0 0 None
0x48 24 tc 0 32 0 r . . 8 8 8 8 0 24 8 0 0 0 0 0 0 None
0x49 24 tc 0 32 0 r y . 8 8 8 8 0 24 0 0 0 0 0 0 0 None
0x4a 24 tc 0 32 0 r . . 8 8 8 8 0 24 0 0 0 0 0 0 0 None
0x4b 24 dc 0 32 0 r y . 8 8 8 8 0 24 8 16 16 16 16 0 0 None
0x4c 24 dc 0 32 0 r . . 8 8 8 8 0 24 8 16 16 16 16 0 0 None
0x4d 24 dc 0 32 0 r y . 8 8 8 8 0 24 0 16 16 16 16 0 0 None
0x4e 24 dc 0 32 0 r . . 8 8 8 8 0 24 0 16 16 16 16 0 0 None
0x4f 24 dc 0 32 0 r y . 8 8 8 8 0 24 8 0 0 0 0 0 0 None
0x50 24 dc 0 32 0 r . . 8 8 8 8 0 24 8 0 0 0 0 0 0 None
0x51 24 dc 0 32 0 r y . 8 8 8 8 0 24 0 0 0 0 0 0 0 None
0x52 24 dc 0 32 0 r . . 8 8 8 8 0 24 0 0 0 0 0 0 0 None
0x53 24 dc 0 32 0 r y . 8 8 8 8 0 24 8 16 16 16 16 0 0 None
0x54 24 dc 0 32 0 r . . 8 8 8 8 0 24 8 16 16 16 16 0 0 None
0x55 24 dc 0 32 0 r y . 8 8 8 8 0 24 0 16 16 16 16 0 0 None
0x56 24 dc 0 32 0 r . . 8 8 8 8 0 24 0 16 16 16 16 0 0 None
0x57 24 dc 0 32 0 r y . 8 8 8 8 0 24 8 0 0 0 0 0 0 None
0x58 24 dc 0 32 0 r . . 8 8 8 8 0 24 8 0 0 0 0 0 0 None
0x59 24 dc 0 32 0 r y . 8 8 8 8 0 24 0 0 0 0 0 0 0 None
0x5a 24 dc 0 32 0 r . . 8 8 8 8 0 24 0 0 0 0 0 0 0 None
0x5b 24 dc 0 32 0 r y . 8 8 8 8 0 24 8 16 16 16 16 0 0 None
0x5c 24 dc 0 32 0 r . . 8 8 8 8 0 24 8 16 16 16 16 0 0 None
0x5d 24 dc 0 32 0 r y . 8 8 8 8 0 24 0 16 16 16 16 0 0 None
0x5e 24 dc 0 32 0 r . . 8 8 8 8 0 24 0 16 16 16 16 0 0 None
0x5f 24 dc 0 32 0 r y . 8 8 8 8 0 24 8 0 0 0 0 0 0 None
0x60 24 dc 0 32 0 r . . 8 8 8 8 0 24 8 0 0 0 0 0 0 None
0x61 24 dc 0 32 0 r y . 8 8 8 8 0 24 0 0 0 0 0 0 0 None
0x62 24 dc 0 32 0 r . . 8 8 8 8 0 24 0 0 0 0 0 0 0 None
0x63 24 dc 0 32 0 r y . 8 8 8 8 0 24 8 16 16 16 16 0 0 None
0x64 24 dc 0 32 0 r . . 8 8 8 8 0 24 8 16 16 16 16 0 0 None
0x65 24 dc 0 32 0 r y . 8 8 8 8 0 24 0 16 16 16 16 0 0 None
0x66 24 dc 0 32 0 r . . 8 8 8 8 0 24 0 16 16 16 16 0 0 None
0x67 24 dc 0 32 0 r y . 8 8 8 8 0 24 8 0 0 0 0 0 0 None
0x68 24 dc 0 32 0 r . . 8 8 8 8 0 24 8 0 0 0 0 0 0 None
0x69 24 dc 0 32 0 r y . 8 8 8 8 0 24 0 0 0 0 0 0 0 None
0x6a 24 dc 0 32 0 r . . 8 8 8 8 0 24 0 0 0 0 0 0 0 None
0x6b 24 dc 0 32 0 r y . 8 8 8 8 0 24 8 16 16 16 16 0 0 None
0x6c 24 dc 0 32 0 r . . 8 8 8 8 0 24 8 16 16 16 16 0 0 None
0x6d 24 dc 0 32 0 r y . 8 8 8 8 0 24 0 16 16 16 16 0 0 None
0x6e 24 dc 0 32 0 r . . 8 8 8 8 0 24 0 16 16 16 16 0 0 None
0x6f 24 dc 0 32 0 r y . 8 8 8 8 0 24 8 0 0 0 0 0 0 None
0x70 24 dc 0 32 0 r . . 8 8 8 8 0 24 8 0 0 0 0 0 0 None
0x71 24 dc 0 32 0 r y . 8 8 8 8 0 24 0 0 0 0 0 0 0 None
0x72 24 dc 0 32 0 r . . 8 8 8 8 0 24 0 0 0 0 0 0 0 None
0x85 32 tc 0 32 0 r . . 8 8 8 8 0 0 0 0 0 0 0 0 0 Ncon
~]$

I occured the SAME QUESTION!
anyone can help