  We present a systematic definition and analysis of the thermo-electric linear
response in gauge/gravity systems focusing especially on models with massive
gravity in the bulk and therefore momentum dissipation in the dual field
theory. A precise treatment of finite counter-terms proves to be essential to
yield a consistent physical picture whose hydrodynamic and beyond-hydrodynamics
behaviors noticeably match with field theoretical expectations. The model
furnishes a possible gauge/gravity description of the crossover from the
quantum-critical to the disorder-dominated Fermi-liquid behaviors, as expected
in graphene.
