[Bug 1885730] Re: Please switch default, hwe, oem kernel flavours governor to CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y , such that advanced userspace utilities such as game-mode can be later used to rev-up to to performance, or rev-down to powersave.

[Dimitri John Ledkov]

Proof that we must not use performance governor attached, from one of my
team mates.

** No longer affects: systemd (Ubuntu)

** Attachment added: "performance-governor.jpg"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1885730/+attachment/5403156/+files/performance-governor.jpg

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Title:
  Please switch default, hwe, oem kernel flavours governor to
  CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y , such that advanced userspace
  utilities such as game-mode can be later used to rev-up to to
  performance, or rev-down to powersave.

Status in linux package in Ubuntu:
  In Progress
Status in linux-oem-5.6 package in Ubuntu:
  Confirmed
Status in linux-riscv package in Ubuntu:
  Confirmed
Status in linux source package in Focal:
  Triaged
Status in linux-oem-5.6 source package in Focal:
  Confirmed
Status in linux-riscv source package in Focal:
  Confirmed
Status in systemd source package in Focal:
  Fix Released
Status in linux source package in Groovy:
  In Progress
Status in linux-oem-5.6 source package in Groovy:
  Confirmed
Status in linux-riscv source package in Groovy:
  Confirmed
Status in systemd source package in Groovy:
  Invalid

Bug description:
  [Impact]

   * Kernel should have sensible default governor set to
  CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y for the generic, hwe, raspi,
  riscv, oem kernel flavours in Focal and Groovy+.

   * ondemand.service must not be shipped by systemd package

   * kvm flavour, cloud-kernels flavours should continue using
  performance governor.

   * Users should be given control to rev-up to performance, or rev-down
  to powersave using other tools, i.e. game-mode and/or similar CLI or
  GUI tools (these are scheduled to be integrated on Ubuntu platform
  later).

  [Test Case]

   * Boot ubuntu generic, hwe, or oem kernel

   * Check that default governor is ondemand

   * Check that ondemand.service is not active

  [Regression Potential]

   * ondemand governor is the best kernel default as recently analyzed
  by colin king, it gives a balance bootspeed and power, giving as
  responsive machines whilst not wasting power. It is the best
  experience we can give our users by default.

  [Other Info]

   * It is up to the user to elect/switch to powersave for maximum
  battery life, or to the performance for maximum processing power (i.e.
  gaming / computation).

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