Hi PowerTop developers, I've been testing PowerTop on various OS and platforms, and found on some platforms or OS, Powertop show only "idle 100%"s in the frequency page, no other frequencies and their percentage. For example, currently I'm test RHEL6, on some new client platforms, which intel_pstate is not supported yet, the frequencies and their percentage could be listed below idle percentage. but on the mature platforms, where intel_pstate is governing, I could only get "idle 100%" under each Package/Core/CPU. (well, the "Actual" frequency under each "CPU" looks normal) I tried Powertop 2.3 and 2.7, and had guessed it should be intel_pstate not providing some necessary info to Powertop. But it's not the case on my i5-5300U machine, it is governed by intel_pstate, but shows frequencies well. I tried this with Powertop 2.6.1 and 2.7. Could you help to explain, why Powertop show only "idle 100%"s in the frequency page? Thanks~ The following is an example, captured from a Haswell-EP server: PowerTOP 2.7 Overview Idle stats Frequency stats Device stats Tunables Package | Core | CPU 0 CPU 4 | | Actual 3.2 GHz 1.9 GHz Idle 100.0% | Idle 100.0% | Idle 100.0% 100.0% | s 9 Core | CPU 1 CPU 5 | | Actual 3.4 GHz 2.3 GHz | Idle 100.0% | Idle 100.0% 100.0% | Core | CPU 2 CPU 6 | | Actual 2.0 GHz 2.3 GHz | Idle 100.0% | Idle 100.0% 100.0% | s Core | CPU 3 CPU 7 | s | Actual 2.3 GHz 2.6 GHz | Idle 100.0% | Idle 100.0% 100.0% -Wang, Xiaolong