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[Launchpad Bug Tracker <1803360@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package thermald - 1.7.0-5ubuntu2

---------------
thermald (1.7.0-5ubuntu2) bionic; urgency=medium

  * Honor ACPI _CRT for processor thermal zone (LP: #1803360)
    There are some new fanless platforms use DPTF's virtual sensor
    instead of INT340X devices. Because of that, the _PSV is no
    longer in use, at least not directly, hence its value may set
    higher then _CRT. To a fanless system that means no cooling
    device gets activated before _CRT, so the system will be
    considered overheated by Linux kernel, and gets shutdown by the
    kernel.  Upstream fixes:
     - 7af3eef07dc7 Ignore _TRT and B0D4 device if passive 1 UUID not present
       (prerequisite)
     - 97976782dd26 Honor ACPI _CRT for processor thermal zone

 -- Colin King <colin.king@xxxxxxxxxxxxx>  Mon, 14 Jan 2019 23:29:41
+0000

** Changed in: thermald (Ubuntu Bionic)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1803360

Title:
  Fanless systems with DPTF shutdown before using any passive cooling
  device

Status in thermald package in Ubuntu:
  Fix Released
Status in thermald source package in Xenial:
  Won't Fix
Status in thermald source package in Bionic:
  Fix Released
Status in thermald source package in Cosmic:
  Fix Committed
Status in thermald source package in Disco:
  Fix Released

Bug description:
  == SRU Justification, Cosmic, Bionic, Xenial ==

  There are some new fanless platforms use DPTF's virtual sensor instead
  of INT340X devices.

  Because of that, the _PSV is no longer in use, at least not directly,
  hence its value may set higher then _CRT. To a fanless system that means
  no cooling device gets activated before _CRT, so the system will be
  considered overheated by Linux kernel, and gets shutdown by the kernel.

  == Fix ==
   
  Upstream fix https://github.com/intel/thermal_daemon/commit/97976782dd26b4d592ccb97eb89c2a3a871a22a9

  == Testing ==

  Exercise CPUs on a fanless INT340X device with _CRT ACPI objects and
  try and reach the trip point. Without the fix thermal overrun occurs
  and this trips CPU shutdown. With the fix, thermald will start to
  throttle the system and get it out of the thermal overrun zone.

  == Regression Potential ==

  This modifies the behavior for just INT340X devices with ACPI _CRT
  objects, specifically, now to honor this setting.  This is a small
  subset of devices with these objects and the change will in face make
  thermald catch systems before they hit thermal overrun, so the risk of
  regression is small. This fix also has been reviewed by the thermal
  experts at Intel, so it seems like a very reasonable workaround for
  these specific use cases.

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