The only control surfaces mechanically connected to the flight deck on a 777 are a pair of flight spoilers and the horizotal stab trim system.
Airbus FBW originally had mechanically connected stab trim and rudder but AI eliminated the mechanically signalled rudder and replaced it with an independant electrically signalled backup system.
The control surfaces still need hydraulic power to operate ie. there is no reversion to manual (tab) operation on loss of hydraulics as on a DC8 ailerons or rudder for example.