Energetical aspects of solar-like oscillations in red giants

CoRoT and Kepler observations of red giants reveal a large variety of spectra of non- radial solar- like oscillations. Up to now we understood pretty well the frequency patterns for the different global properties or different evolutionary stages of the stars. Here we are interested in the theoretical predictions for the two other components of a power spectra (the linewitdths and the heights). The study of energetic aspects of these oscillations is of great importance to predict the peak parameters in the power spectrum. I will discuss under which circumstances mixed modes are detectable for a large variety of red-giant stellar models, with emphasis on the effect of the evolutionary status of the star along the red-giant branch, for a wide range of stellar masses (from 1 to 2M⊙ ) on theoretical power spectra.