Some very good detail here:
AirbusFlight Control Laws
MECHANICAL BACKUP
In case of a complete loss of electrical flight control signals, the aircraft can be temporarily controlled by mechanical mode.- Pitch control is achieved through the horizontal stabilizer by using the manual trim wheel.
- Lateral control is accomplished using the rudder pedals.
- Both controls require hydraulic power.
- A red MAN PITCH TRIM ONLY warning appears on the PFD.