It would be good if all those with the same issue as the original reporter would try out those DRM snapshot modules and say if they work or not.
If it can help anything, I compiled the modules for the current 2.6.20-16-generic kernel version. The attached archive file has two kernel modules that should be copied to /lib/modules/2.6.20-16-generic/kernel/drivers/char/drm/ (and nowhere else). Make a backup of the old modules before you copy. Reboot and test.
It would be good if all those with the same issue as the original reporter would try out those DRM snapshot modules and say if they work or not.
If it can help anything, I compiled the modules for the current 2.6.20-16-generic kernel version. The attached archive file has two kernel modules that should be copied to /lib/modules/ 2.6.20- 16-generic/ kernel/ drivers/ char/drm/ (and nowhere else). Make a backup of the old modules before you copy. Reboot and test.