[Bug 1727158] Re: lscpu shows incorrect instantaneous CPU MHz value

[Adrian]

I can confirm this issue on 17.10. It worked fine in 16.10 from which I
upgraded.

Model name:          Intel(R) Core(TM) i7-3930K CPU @ 3.20GHz
Stepping:            7
CPU MHz:             3200.149
CPU max MHz:         4000.0000
CPU min MHz:         1200.0000

Meanwhile, the "i7z" utility correctly reports the current clockrate,
i.e. 1200 Mhz idle and 4000 MHz under load.

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Title:
  lscpu shows incorrect instantaneous CPU MHz value

Status in util-linux package in Ubuntu:
  Confirmed

Bug description:
  Ubuntu 17.10:

  lscpu has the following fields of interest to this report:

  Model name:          Intel(R) Core(TM) i7-2700K CPU @ 3.50GHz

  CPU MHz:             3499.996
  CPU max MHz:         5900.0000
  CPU min MHz:         1600.0000

  The CPU MHz field is incorrect:  At idle it never shows down-step, and
  at full load, it never shows the CPU's boost frequency (which should
  be up to about 4.6GHz on my system).

  This was working correctly under Ubuntu 17.04, showing the full range
  between 1600 and 4600.  But with Ubuntu 17.10 it remains constantly at
  the CPU's design spec of 3499.996.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: util-linux 2.30.1-0ubuntu4
  ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
  ApportVersion: 2.20.7-0ubuntu3
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Tue Oct 24 22:00:02 2017
  InstallationDate: Installed on 2017-09-01 (53 days ago)
  InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: util-linux
  UpgradeStatus: Upgraded to artful on 2017-10-20 (5 days ago)

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