  RS Oph has persistently displayed flickering at optical wavelengths when
observed away from its repeating nova outbursts. During the 2006 eruption the
flickering disappeared, and this repeated during the recent 2021 event. We have
been monitoring RS Oph looking for the reappearance of flickering at B-band
following the 2021 outburst. The flickering was still absent (sigma(B)<0.002
mag) on day +210 (counted from nova optical maximum), appeared at
sigma(B)=0.008 mag on day +224, and raised to sigma(B)=0.029 mag on day +250.
On following dates the amplitude remained large, although fluctuating. The
recovery of B-band quiescence brightness by RS Oph begun around day +225 and
was completed by day +260. The parallel patterns followed by the rise in system
brightness and the reappearance of flickering confirm the central role played
in RS Oph by the return to pre-outburst conditions of the accretion disk and
the refilling by the RG wind of the immediate circumstellar space.
