[Bug 1794254] Re: Dell Precision 5520 in Battery mode stopped Low Power modes. No CPU speed stepping.

[Johannes Horvath]

CPU speed scaling restored by removing: cpufreqd
Actually user space scaling programs influence intel_pstate clock scaling method.
Recommended to remove:
sudo apt-get remove powernowd cpudyn cpufreqd powersaved speedfreqd 


** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1794254

Title:
  Dell Precision 5520 in Battery mode stopped Low Power modes. No CPU
  speed stepping.

Status in ubuntu-release-upgrader package in Ubuntu:
  Invalid

Bug description:
  Booted the Laptop: Dell Precision 5520 with Xubuntu 18.04 With a Live
  USB boot disk. A full battery shows about 12 hours remaining operating
  time.

  Booting from internal HD with updated Xubuntu 18.04 to date, CPU clock seems to be fixed to 2.32GHz, Battery life is 4 hours.
  I did not modify anything related to CPU scaling. 

  This behaviour might have popped up with one of the updates.

  1.
  lsb_release -rd
  Description:	Ubuntu 18.04.1 LTS
  Release:	18.04

  2.
  Package name for meeting low power mode is unknown to me. (part of the kernel?)

  3.
  When using the Dell precision 5520 in battery mode, I expect more then 10 hours battery life time.

  4.
  With the current updated Xubuntu 18.04 the Battery is flat after 4 hours.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.25
  ProcVersionSignature: Ubuntu 4.15.0-34.37-generic 4.15.18
  Uname: Linux 4.15.0-34-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.2
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: XFCE
  Date: Tue Sep 25 10:11:24 2018
  InstallationDate: Installed on 2018-07-16 (70 days ago)
  InstallationMedia: Xubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  Symptom: release-upgrade
  UpgradeStatus: No upgrade log present (probably fresh install)
  mtime.conffile..etc.update-manager.release-upgrades: 2018-07-16T14:01:08.890425

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