[Bug 1934944] Re: power-profiles-daemon package conflicts with TLP

[Bin Li]

** Changed in: oem-priority
     Assignee: (unassigned) => Bin Li (binli)

** Changed in: oem-priority
       Status: New => Triaged

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Title:
  power-profiles-daemon package conflicts with TLP

Status in OEM Priority Project:
  Triaged
Status in tlp package in Ubuntu:
  Confirmed

Bug description:
  THE PROBLEM:

  The new power-profiles-daemon package (installed by default in Ubuntu
  21.04) comes with a systemd unit power-profiles-daemon.service. This
  unit declares a conflict with tlp.service causing tlp.service to be
  effectively disabled.

  /lib/systemd/system/power-profiles-daemon.service (notice the Conflicts= directive)
  --------------
  [Unit]
  Description=Power Profiles daemon
  Conflicts=tuned.service tlp.service auto-cpufreq.service
  Before=multi-user.target display-manager.target

  ...
  --------------

  If a unit has a Conflicts= directive on another unit, starting the
  former will stop the latter and vice versa. And because tlp.service
  doesn't declare Conflicts= directive on power-profiles-daemon.service,
  it will always be the one that gets disabled during system startup
  regardless of the activation order of the units.

  An issue has been reported to the project maintainer regarding this
  [1].

  EXPECTED BEHAVIOUR:

  TLP package is not installed by default. Installing TLP package
  explicitly should make it the active power management agent in the
  system. Any other power management agents installed in the system
  should be effectively disabled including Power Profiles daemon.

  ACTUAL BEHAVIOUR:

  Even after installing TLP package explicitly. The power-profiles-
  daemon.service unit will remain the active service causing tlp.service
  to be effectively disabled. Although tlp.service unit is disabled, a
  change in the power source will make TLP apply the desired settings.
  This is the case because tlp.service is only responsible for applying
  the TLP settings at boot [2][3].

  PROPOSED SOLUTION:

  TLP service unit may include Conflicts=power-profiles-daemon.service
  directive. This will resolve the issue in the current setup of both
  services, as tlp.service is activated before power-profiles-
  daemon.service.

  Also, configuring TLP service unit with Before=power-profiles-
  daemon.service will make tlp.service activation always takes
  precedence over power-profiles-daemon.service.

  REFERENCES:

  [1] https://github.com/linrunner/TLP/issues/564
  [2] https://linrunner.de/tlp/introduction.html#how-it-works
  [3] https://linrunner.de/tlp/developers/architecture.html

  ProblemType: Bug
  DistroRelease: Ubuntu 21.04
  Package: tlp 1.3.1-2
  ProcVersionSignature: Ubuntu 5.11.0-22.23-generic 5.11.21
  Uname: Linux 5.11.0-22-generic x86_64
  ApportVersion: 2.20.11-0ubuntu65.1
  Architecture: amd64
  CasperMD5CheckResult: unknown
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Jul  8 01:26:37 2021
  InstallationDate: Installed on 2020-03-14 (480 days ago)
  InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Alpha amd64 (20200309)
  PackageArchitecture: all
  SourcePackage: tlp
  UpgradeStatus: Upgraded to hirsute on 2021-06-03 (34 days ago)

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