I can verify that this bug is still present in Debian Lenny with latest updates. I am running a custom 2.6.28 kernel and using a customized xorg.conf. Removing the xorg.conf and letting Xorg autodetect the settings did not help at all. I have not tested the default 2.6.26 kernel.

However, as suggested in a previous comment, setting AccelMethod to "XAA" fixes the issue:

Section "Device"
Identifier "Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller"
       Driver          "intel"
       Option          "AccelMethod"   "XAA"
EndSection

Some information about my system:

$ lspci|grep -i vga
00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller (rev 03)

Relevant packages:

compiz 0.7.6-7
compiz-core 0.7.6-7
compiz-fusion-plugins-main 0.7.6-1
compiz-gnome 0.7.6-7
compiz-gtk 0.7.6-7
compiz-plugins 0.7.6-7
compizconfig-backend-gconf 0.7.6-1
compizconfig-settings-manager 0.7.6-3
libcompizconfig0 0.7.6-1
python-compizconfig 0.7.6-1
xserver-xorg 1:7.3+18
xserver-xorg-video-intel 2:2.3.2-2+lenny6


$ 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_MESA_copy_sub_buffer,
   GLX_OML_swap_method, GLX_SGI_make_current_read, GLX_SGI_swap_control,
   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_MESA_allocate_memory,
   GLX_MESA_copy_sub_buffer, GLX_MESA_swap_control,
GLX_MESA_swap_frame_usage, GLX_OML_swap_method, GLX_SGI_make_current_read,
   GLX_SGI_swap_control, GLX_SGI_video_sync, GLX_SGIS_multisample,
   GLX_SGIX_fbconfig, GLX_SGIX_visual_select_group
OpenGL vendor string: Tungsten Graphics, Inc
OpenGL renderer string: Mesa DRI Intel(R) 945GM 20061017 x86/MMX/SSE2
OpenGL version string: 1.3 Mesa 7.0.4
OpenGL extensions:
   GL_ARB_depth_texture, GL_ARB_fragment_program, GL_ARB_imaging,
   GL_ARB_multisample, GL_ARB_multitexture, GL_ARB_point_parameters,
   GL_ARB_shadow, 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_texture_rectangle, GL_ARB_transpose_matrix,
   GL_ARB_vertex_buffer_object, GL_ARB_vertex_program, GL_ARB_window_pos,
   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_clip_volume_hint,
   GL_EXT_cull_vertex, GL_EXT_compiled_vertex_array, GL_EXT_convolution,
   GL_EXT_copy_texture, GL_EXT_draw_range_elements, GL_EXT_fog_coord,
   GL_EXT_histogram, GL_EXT_multi_draw_arrays, GL_EXT_packed_pixels,
   GL_EXT_point_parameters, GL_EXT_polygon_offset, 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_texture, GL_EXT_texture3D, 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_object, GL_EXT_texture_rectangle,
   GL_EXT_vertex_array, GL_3DFX_texture_compression_FXT1,
   GL_APPLE_client_storage, GL_APPLE_packed_pixels,
   GL_ATI_blend_equation_separate, GL_IBM_rasterpos_clip,
   GL_IBM_texture_mirrored_repeat, GL_INGR_blend_func_separate,
   GL_MESA_pack_invert, GL_MESA_ycbcr_texture, GL_MESA_window_pos,
   GL_NV_blend_square, GL_NV_light_max_exponent, GL_NV_texture_rectangle,
   GL_NV_texgen_reflection, GL_NV_vertex_program, GL_NV_vertex_program1_1,
   GL_OES_read_format, GL_SGI_color_matrix, GL_SGI_color_table,
   GL_SGIS_generate_mipmap, GL_SGIS_texture_border_clamp,
   GL_SGIS_texture_edge_clamp, GL_SGIS_texture_lod, GL_SGIX_depth_texture,
   GL_SUN_multi_draw_arrays

  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 16 tc  0 16  0 r  y  .  5  6  5  0  0 16  0  0  0  0  0  0 0 None
0x24 16 tc  0 16  0 r  .  .  5  6  5  0  0 16  0  0  0  0  0  0 0 None
0x25 16 tc  0 16  0 r  y  .  5  6  5  0  0 16  8  0  0  0  0  0 0 Slow
0x26 16 tc  0 16  0 r  .  .  5  6  5  0  0 16  8  0  0  0  0  0 0 Slow
0x27 16 tc  0 16  0 r  y  .  5  6  5  0  0 16  0 16 16 16  0  0 0 Slow
0x28 16 tc  0 16  0 r  .  .  5  6  5  0  0 16  0 16 16 16  0  0 0 Slow
0x29 16 tc  0 16  0 r  y  .  5  6  5  0  0 16  8 16 16 16  0  0 0 Slow
0x2a 16 tc  0 16  0 r  .  .  5  6  5  0  0 16  8 16 16 16  0  0 0 Slow
0x2b 16 dc  0 16  0 r  y  .  5  6  5  0  0 16  0  0  0  0  0  0 0 None
0x2c 16 dc  0 16  0 r  .  .  5  6  5  0  0 16  0  0  0  0  0  0 0 None
0x2d 16 dc  0 16  0 r  y  .  5  6  5  0  0 16  8  0  0  0  0  0 0 Slow
0x2e 16 dc  0 16  0 r  .  .  5  6  5  0  0 16  8  0  0  0  0  0 0 Slow
0x2f 16 dc  0 16  0 r  y  .  5  6  5  0  0 16  0 16 16 16  0  0 0 Slow
0x30 16 dc  0 16  0 r  .  .  5  6  5  0  0 16  0 16 16 16  0  0 0 Slow
0x31 16 dc  0 16  0 r  y  .  5  6  5  0  0 16  8 16 16 16  0  0 0 Slow
0x32 16 dc  0 16  0 r  .  .  5  6  5  0  0 16  8 16 16 16  0  0 0 Slow
0x68 32 tc  0 32  0 r  .  .  8  8  8  8  0  0  0  0  0  0  0  0 0 Ncon



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