With Jessie, amd64, and the Mate desktop, the command
does not display the full information. Only the "perfomance" and "powersave" governors appear ("ondemand", "conservative", and "userspace" are missing), and the actual frequency is not displayed. This issue concerns only Mate, with Gome and Xfce, everything is OK, provided that Mate is not installed. Possibly, the frequency is not adjusted to the demand, it may be set too high (but I am not sure about this).
Mate is nice desktop! Many thanks!
-- François P. Rotzinger Privat-docent (lecturer) Ecole Polytechnique Fédérale de Lausanne (EPFL) Institut des Sciences et Ingénierie Chimiques (ISIC) Station 6 CH-1015 Lausanne Switzerland