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[Launchpad Bug Tracker <1480349@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package thermald - 1.4.3-5ubuntu1

---------------
thermald (1.4.3-5ubuntu1) wily; urgency=medium

  * Fix frequency scaling issue on specific Intel CPUs (LP: #1480349)
    - roll earlier patches that allow us to cleanly patch the issue
    - Error recovery when sysfs attrib read fails
    - Remove wild card for loading
    - Move parser init to thd_engine
    - Add white list of the cpu ids

 -- Colin King <colin.king@xxxxxxxxxxxxx>  Tue, 26 Jan 2016 10:15:11
+0000

** Changed in: thermald (Ubuntu Wily)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1480349

Title:
  thermald breaks frequency scaling in Xeon® E5-2687W v3 & E5-1650 v3

Status in thermald package in Ubuntu:
  Fix Released
Status in thermald source package in Trusty:
  Fix Released
Status in thermald source package in Vivid:
  Won't Fix
Status in thermald source package in Wily:
  Fix Released
Status in thermald source package in Xenial:
  Fix Released

Bug description:
  SRU Justification Wily, Vivid, Trusty

  CPU scaling on a class of Intel CPUs is not functioning correctly,
  causing the CPU to be throttled back to the lowest CPU frequency

  [FIX]
  Upstream cherry picks, as recommended by Intel
  f4e316ef4d8d8c9a558ef5bfa74e25303c46a985 ("Add white list of the cpu ids")
  18d1574230c6b9b4e8876c0b6739c074a24205e6 ("Move parser init to thd_engine")
  6749427098434ccad81fa8c5f2a3e102fc1644f7 ("Remove wild card for loading")
  ba4fe1e7bb77d09530544cda860fba559603ec83 ("Error recovery when sysfs attrib read fails")

  Plus 4 changes to allow clean and simpler patching of the above 4 fix
  to reduce the risk of breaking thermald with a complex backport:

  Remove trailing ':' from THD engine failure message
  Remove !! from "No coretemp sysfs found"
  Add new option for config file
  Support target state

  Essentially we now have a white list of valid CPUs to run thermald on,
  so we can exclude the issues on a wider class of CPUs.

  [TEST CASE]
  With the buggy thermald, CPU is pegged at the lowest CPU frequency.  With the fixed thermald, CPU scaling now works.

  [REGRESSION POTENTIAL]
  We are allowing thermald now to run on a strict set of CPUs, so we are hoping that the whitelist covers the class that we can legitimately run thermald against.

  --------------------------------------------------------------------------

  When I boot with this installed frequency scaling is no longer
  behaving as expected.

  It seems that with this installed, the OS loses control of the
  scaling.

  It seems that scaling is performed, though. And very much to the
  purpose of power saving.

  Performance is terrible because of this. And I do mean terrible.

  The default governor is powersave.

  Setting the governor to performance (yes, on all cores) doesn't seem
  to change to scaling behavior. The frequency doesn't pass 800MHz.

  I would like to use Intel's microcode updates, but I have to have my
  CPU running at the speed for which it costs so damn much.

  Any suggestions?

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: intel-microcode 3.20150121.1
  ProcVersionSignature: Ubuntu 4.1.0-2.2-generic 4.1.3
  Uname: Linux 4.1.0-2-generic x86_64
  ApportVersion: 2.18-0ubuntu5
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Fri Jul 31 17:56:39 2015
  InstallationDate: Installed on 2010-10-12 (1753 days ago)
  InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
  SourcePackage: intel-microcode
  UpgradeStatus: Upgraded to wily on 2014-11-11 (262 days ago)

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