[en] The recent experimental CMS and E-by-E ATLAS data on the elliptic anisotropy of particles in Pb–Pb collisions are used to extract parton medium cross-section and the quark–gluon plasma (QGP) viscosity-to-entropy ratio within the incomplete equilibration medium model. Our method assumes extrapolation of the measured pseudorapidity spectrum of charged particles to low-p_T range. Then the rapidity distribution of both charged and neutral hadrons is restored. The extracted value of the parton-medium cross section is found to be $\mathrm{\sigma <!--\; ??\; -->}=(3.1\pm <!--\; ??\; -->0.2)\mathrm{m}\mathrm{b}.$ It yields $\mathrm{\eta <!--\; ??\; -->}/s=0.17\pm <!--\; ??\; -->0.02$ for the ratio of shear viscosity to entropy density in QGP phase. The last result is in a good agreement with the estimates obtained by calculations within the viscous hydrodynamics. (paper)