I upgraded from Ubuntu 11.04 (using fglrx driver from AMD site) to 11.10. After upgrade 3D acceleration is not working with my Radeon HD 5570 fails to run any program with 3D acceleration. I tried to remove ATI driver and reinstall it but to no avail. I also tried Live CD and there open source driver works great, but I don't know how to enable it on my computer.
Uninstalling fglrx didn't work. Any ideas?