Removed old .compiz/config, same problem. What happens is that on login,
first the screen goes black, then the wall paper is drawn over the whole
screen.

Then the gnome panel bar at the top of the screen is drawn, and all the
screen below that is black. The system still runs fine, windows wobble
etc.

If I stop compiz and run compiz.real by hand (to prevent any fix ups it
might do, I get)

compiz.real (core) - Fatal: GLX_EXT_texture_from_pixmap is missing
compiz.real (core) - Error: Failed to manage screen: 0
compiz.real (core) - Fatal: No manageable screens found on display :0.0

However, if I run glxinfo, I get 
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

So is compiz failing to see "GLX_EXT_texture_from_pixmap" for this card?

glxinfo and Xorg.0.log attached (or will be, as this is a serial
activity).

** Attachment added: "glxinfo.txt"
   http://launchpadlibrarian.net/31163098/glxinfo.txt

-- 
[karmic] When running compiz, wallpaper is not displayed
https://bugs.launchpad.net/bugs/385539
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