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

[Johannes Horvath]

** Description changed:

- Booted the Dell 5520 with Xubuntu 18.04 Live USB boot disk. A full
- battery shows about 12 hours remaining operating time.
+ 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 with updated Xubuntu 18.04 CPU clock seems to be fixed to
- 2.32GHz, Battery life 4 hours.
+ 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.
  
  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)
+ 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.
- Instead the Battery is flat after 4 hours.
+ 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

** Description changed:

  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.
+ 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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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:
  New

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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