The process of laser generation of ultrasound in metals with internal mechanical stresses is analyzed. The features of the photoacoustic signal behavior near the hole in the D16 alloy plate when subjected to mechanical stresses are investigated. The discrepancy between the experimental results and the predictions of the thermodynamic model of the dependence of the coefficient of thermal expansion on mechanical stresses has been revealed. To correctly describe the features of the signal behavior in real metals, it was proposed to take into account the effect of the electronic subsystem on the laser generation of acoustic vibrations.