[Bug 1748543] Re: intel-microcode when installed on an i7-6850k based system breaks overclock

[Dimitri John Ledkov]

CPU microcode can be also be updated by the motherboard firmware. Have
you upgraded your motherboard firmware recently and/or installed uefi
capsules?

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https://bugs.launchpad.net/bugs/1748543

Title:
  intel-microcode when installed on an i7-6850k based system breaks
  overclock

Status in intel-microcode package in Ubuntu:
  Confirmed

Bug description:
  I have an I7-6850k machine Asus X99-A motherboard, 128GB memory with
  Artful 17.10 installed.  The official clock speed of this processor is
  3.6 Ghz, I have it clocked at 4.3 Ghz, however, if I install the
  intel-microcode package, the machine ignores the BIOS settings and
  reverts to 3.6 Ghz.  Since this package is necessary from a security
  perspective I'm stuck with either being insecure or losing an enormous
  amount of performance.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: intel-microcode (not installed)
  ProcVersionSignature: Ubuntu 4.13.0-32.35-lowlatency 4.13.13
  Uname: Linux 4.13.0-32-lowlatency x86_64
  ApportVersion: 2.20.7-0ubuntu3.7
  Architecture: amd64
  CurrentDesktop: MATE
  Date: Fri Feb  9 13:04:14 2018
  InstallationDate: Installed on 2017-05-05 (280 days ago)
  InstallationMedia: Ubuntu-MATE 17.04 "Zesty Zapus" - Release amd64 (20170412)
  SourcePackage: intel-microcode
  UpgradeStatus: Upgraded to artful on 2017-10-20 (112 days ago)

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