Comment 8 for bug 31527

I dowloaded and installed ubuntu 5.10 on DVD and had a problem with my PCI radeon 9250 just as described here. After poking around a little I tried adding the modules DBE and V41 to the list of loaded modules. Mostly because DBE was mentioned in the context of secondary VGA cards. Well wouldn't you know that X started working with DRI.

I am not sure this will work for others but it might be worth a try