mdoprobe radeon :

WARNING: Error inserting drm (/lib/modules/2.6.17-10-generic/kernel/drivers/char/drm/drm.ko): Cannot allocate memory
FATAL: Error inserting radeon (/lib/modules/2.6.17-10-generic/kernel/drivers/char/drm/radeon.ko): Unknown symbol in module, or unknown parameter (see dmesg)

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dmesg:

[17184217.108000] radeon: Unknown symbol drm_open
[17184217.108000] radeon: Unknown symbol drm_fasync
[17184217.108000] radeon: Unknown symbol drm_poll
[17184217.108000] radeon: Unknown symbol drm_get_resource_len
[17184217.108000] radeon: Unknown symbol drm_core_get_reg_ofs
[17184217.108000] radeon: Unknown symbol drm_irq_uninstall
[17184217.108000] radeon: Unknown symbol drm_ioctl
[17184217.108000] radeon: Unknown symbol drm_exit
[17184217.108000] radeon: Unknown symbol drm_debug
[17184217.108000] radeon: Unknown symbol drm_core_get_map_ofs
[17184217.108000] radeon: Unknown symbol drm_init
[17184217.108000] radeon: Unknown symbol drm_addmap
[17184217.108000] radeon: Unknown symbol drm_ioremapfree
[17184217.108000] radeon: Unknown symbol drm_ioremap
[17184217.108000] radeon: Unknown symbol drm_get_resource_start
[17184217.108000] radeon: Unknown symbol drm_vbl_send_signals
[17184217.108000] radeon: Unknown symbol drm_ati_pcigart_init
[17184217.108000] radeon: Unknown symbol drm_mmap
[17184217.108000] radeon: Unknown symbol drm_order
[17184217.108000] radeon: Unknown symbol drm_ati_pcigart_cleanup
[17184217.108000] radeon: Unknown symbol drm_core_reclaim_buffers
[17184217.108000] radeon: Unknown symbol drm_release