  In this paper, we investigate an extension of the standard $\Lambda$CDM model
by allowing: a temporal evolution in the equation of state (EoS) of DM via
Chevallier-Polarski-Linder parametrization, and the constant non-null sound
speed. We also consider the properties of neutrinos, such as the effective
neutrino mass and the effective number of neutrino species as free parameters.
We derive the constraints on this scenario by using the data from the
Planck-2018 cosmic microwave background (CMB), baryonic acoustic oscillation
(BAO) measurements, Pantheon+ compilation of Type Ia supernovae (SNe Ia), and
some large scale structure (LSS) information from the cosmic shear surveys:
Kilo Degree Survey (KiDS)-1000 and Dark Energy Survey (DES). We find
constraints on the EoS and sound speed of DM very close to the null value in
all the analyses, and thus no significant evidence is found beyond the standard
CDM paradigm. In all the analyses, we find the significantly tight upper bounds
on the sum of neutrino masses, and significantly lower mean values of $S_8$,
which are in agreement with the LSS measurements. Thus, the well-known $S_8$
tension is reconciled in the considered model.
