[Bug 2087816] Re: Backport thermald 2.5.8 to noble to support Intel Lunar Lake and Arrow Lake CPUs

[Yao Wei]

** Summary changed:

- Upgrade thermald to 2.5.8 to support Intel Lunar Lake and Arrow Lake CPUs in 24.04 LTS
+ Backport thermald 2.5.8 to noble to support Intel Lunar Lake and Arrow Lake CPUs

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Title:
  Backport thermald 2.5.8 to noble to support Intel Lunar Lake and Arrow
  Lake CPUs

Status in OEM Priority Project:
  New
Status in thermald package in Ubuntu:
  New

Bug description:
  [ Impact ]

   * This is a version bump of thermald to 2.5.8, that can support Intel
  Core Ultra Processors (Series 2), aka Lunar Lake and Arrow Lake

   * This version bump also removes modem support for Intel Atom x3, aka
  SoFIA 3G R, and the power control support of the AMD GPU part of Intel
  8xxxG, aka Kaby Lake G.

  [ Test Plan ]

  (as far as we know, we have no Kaby Lake G nor SoFIA 3G R units in our
  labs. it could be tricky if we also need to handle such case.  We
  received confirmation from upstream (Intel) that the code removal
  should not affect Kaby Lake G units currently on the market including
  Intel NUC and laptops/convertibles.  As for SoFIA 3G R, these SoCs are
  sold as Android phones/tablets from 2015.)

  Pick each of the Kaby Lake, Coffee Lake, Comet Lake, Tiger Lake, Alder
  Lake, Raptor Lake, Lunar Lake, and Arrow Lake systems and run the
  following tests:

  1. Run stress-ng, and observe the temperature/frequency/power with s-tui
    - Temperatures should stay just below trip values
    - Power/performance profiles should stay roughly the same between old thermald and new thermald (unless specifically expected eg: to fix premature/insufficient throttling)
  2. check if thermald could read rules from /dev/acpi_thermal_rel and generate the xml file on /etc/thermald/ correctly.
    - this depends on if acpi_thermal_rel exist.
    - if the machine suppots acpi_thermal_rel, the "thermal-conf.xml.auto"
   could be landed in etc/thermald/.
    - if not, the user-defined xml could be created, then jump to (3).
    - run thermald with --loglevel=debug, and compare the log with xml.auto file. check if the configuration could be parsed correctly.
  3. check if thermal-conf.xml and thermal-cpu-cdev-order.xml can be loaded correctly.
    - run thermald with --loglevel=debug, and compare the log with xml files.
    - if parsed correctly, the configurations from XML files would appear in the log.

  [ Where problems could occur ]

   * The above test failed, which means the support for Lunar Lake and
  Arrow Lake are incomplete, or regression happened on the supported
  units

   * Removing support for Kaby Lake G and SoFIA 3G R actually caused
  issues that upstream did not consider

   * Other issues caused by bugfix, feature and refactor commits in
  between.

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