I have noticed that in some games I play in Linux the game speed has become twice a normal speed.

For instance, with Cedega and Half-Life 2, the game speed is so fast that when characters speak, their lines overlap each other and they start another thing before finishing another. Not to mention their animations are about twice the usual speed. Changing the game speed within via the developer console does nothing.

And with the Linux UT2004 demo, the speeds are also off. All across the game, not just when their are 3d things visible, like on the startup menu. The banner at the top zooms across and the characters change about 2 a second (as opposed to about 1 in 3 seconds).

But the distortion is not visible with all games, for instance with Planet Penguin Racer the speeds are perfect. And in Armagetron and Super Tux they're fine too.

Also, if it matters, rendering of video in Xine is fine.

I'm running Kanotix 2005-03 (HD install) with Xorg. As stated in the title, I have a Mobility Radeon 9000. glxinfo sez:

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_visual_info, GLX_EXT_visual_rating,
GLX_EXT_import_context, GLX_OML_swap_method, GLX_SGI_make_current_read,
GLX_SGIS_multisample, GLX_SGIX_fbconfig
client glx vendor string: ATI
client glx version string: 1.3
client glx extensions:
GLX_EXT_visual_info, GLX_EXT_visual_rating, GLX_EXT_import_context,
GLX_ARB_get_proc_address, GLX_ARB_multisample, GLX_ATI_pixel_format_float,
GLX_ATI_render_texture
GLX extensions:
GLX_EXT_visual_info, GLX_EXT_visual_rating, GLX_EXT_import_context,
GLX_ARB_multisample
OpenGL vendor string: ATI Technologies Inc.
OpenGL renderer string: FireMV 2400 PCI DDR Generic
OpenGL version string: 1.3.1003 (X4.3.0-8.14.13)
OpenGL extensions:
GL_ARB_multitexture, GL_EXT_texture_env_add, GL_EXT_compiled_vertex_array,
GL_S3_s3tc, GL_ARB_occlusion_query, GL_ARB_point_parameters,
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_mirrored_repeat,
GL_ARB_transpose_matrix, GL_ARB_vertex_blend, GL_ARB_vertex_buffer_object,
GL_ARB_vertex_program, GL_ARB_window_pos, GL_ATI_element_array,
GL_ATI_envmap_bumpmap, GL_ATI_fragment_shader, GL_ATI_map_object_buffer,
GL_ATI_texture_env_combine3, GL_ATI_texture_mirror_once,
GL_ATI_vertex_array_object, GL_ATI_vertex_attrib_array_object,
GL_ATI_vertex_streams, GL_ATIX_texture_env_combine3,
GL_ATIX_texture_env_route, GL_ATIX_vertex_shader_output_point_size,
GL_EXT_abgr, GL_EXT_bgra, GL_EXT_blend_color, GL_EXT_blend_func_separate,
GL_EXT_blend_minmax, GL_EXT_blend_subtract, GL_EXT_clip_volume_hint,
GL_EXT_draw_range_elements, GL_EXT_fog_coord, GL_EXT_multi_draw_arrays,
GL_EXT_packed_pixels, GL_EXT_point_parameters, GL_EXT_rescale_normal,
GL_EXT_secondary_color, GL_EXT_separate_specular_color,
GL_EXT_stencil_wrap, 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_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_vertex_array,
GL_EXT_vertex_shader, GL_HP_occlusion_test, GL_NV_blend_square,
GL_NV_occlusion_query, GL_NV_texgen_reflection, GL_SGI_color_matrix,
GL_SGIS_generate_mipmap, GL_SGIS_texture_border_clamp,
GL_SGIS_texture_edge_clamp, GL_SGIS_texture_lod, GL_SUN_multi_draw_arrays
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
----------------------------------------------------------------------
0x23 24 tc 0 32 0 r y . 8 8 8 8 0 24 8 16 16 16 16 1 0 Slow
0x24 24 tc 0 32 0 r . . 8 8 8 8 0 24 8 16 16 16 16 1 0 Slow
0x25 24 tc 0 32 0 r y . 8 8 8 8 0 24 0 16 16 16 16 1 0 Slow
0x26 24 tc 0 32 0 r . . 8 8 8 8 0 24 0 16 16 16 16 1 0 Slow
0x27 24 tc 0 32 0 r y . 8 8 8 8 0 24 8 0 0 0 0 1 0 None
0x28 24 tc 0 32 0 r . . 8 8 8 8 0 24 8 0 0 0 0 1 0 None
0x29 24 tc 0 32 0 r y . 8 8 8 8 0 24 0 0 0 0 0 1 0 None
0x2a 24 tc 0 32 0 r . . 8 8 8 8 0 24 0 0 0 0 0 1 0 None
0x2b 24 dc 0 32 0 r y . 8 8 8 8 0 24 8 16 16 16 16 1 0 Slow
0x2c 24 dc 0 32 0 r . . 8 8 8 8 0 24 8 16 16 16 16 1 0 Slow
0x2d 24 dc 0 32 0 r y . 8 8 8 8 0 24 0 16 16 16 16 1 0 Slow
0x2e 24 dc 0 32 0 r . . 8 8 8 8 0 24 0 16 16 16 16 1 0 Slow
0x2f 24 dc 0 32 0 r y . 8 8 8 8 0 24 8 0 0 0 0 1 0 None
0x30 24 dc 0 32 0 r . . 8 8 8 8 0 24 8 0 0 0 0 1 0 None
0x31 24 dc 0 32 0 r y . 8 8 8 8 0 24 0 0 0 0 0 1 0 None
0x32 24 dc 0 32 0 r . . 8 8 8 8 0 24 0 0 0 0 0 1 0 None

However I don't think it's specifically to do with the graphics card, as when I change to software rendering in UT2004 the game speed is still crazy. The 'setspeed' command (which, yup, you guessed it, changes game speed) doesn't work either.

Any help is much appreciated.

edit: I upgraded the kernel to 2.6.12-kanotix-1from 2.6.11-kanotix-11 and that didn't help.

Hmm, the problem appears to be with the cpu stepping - when it changes the games don't realize it and continue using a different clock speed...or something. But when I manually set the CPU speed to its maximum using cpufreq-utils and tried playing all was fine.