Apparently "proposed" kernel updates for quantal (3.5.0-37.58) and raring (3.8.0-28.41) both carry the necessary patch: "radeon: Fix system hang issue when using KMS with older cards". Indeed, the updated kernel for raring works fine :-)
Apparently "proposed" kernel updates for quantal (3.5.0-37.58) and raring (3.8.0-28.41) both carry the necessary patch: "radeon: Fix system hang issue when using KMS with older cards". Indeed, the updated kernel for raring works fine :-)