  We present our latest results on the connection between accretion rate and
relativistic jet power in AGN, by using a large sample which includes mostly
blazars, but contains also some radio--galaxies. The jet power can be traced by
$\gamma$--ray luminosity in the case of blazars, and radio luminosity for both
classes. The accretion disc luminosity is instead traced by the broad emission
lines. Among blazars, we find a correlation between broad line emission and the
$\gamma$--ray or radio luminosities, suggesting a direct tight connection
between jet power and accretion rate. We confirm that the observational
differences between blazar subclasses reflect differences in the accretion
regime, but with blazars only we cannot properly access the low--accretion
regime. By introducing radio--galaxies, we succeed in observing the fingerprint
of the transition between radiatively efficient and inefficient accretion discs
in the jetted AGN family. The transition occurs at the standard critical value
$L_{\rm d}/L_{\rm Edd}\sim10^{-2}$ and it appears smooth. Below this value, the
ionizing luminosity emitted by the accretion structure drops significantly.
