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[Bug 1803360] Re: Fanless systems with DPTF shutdown before using any passive cooling device

To: group.of.nepali.translators@xxxxxxxxxxxxxxxxxxx
From: Colin Ian King <1803360@xxxxxxxxxxxxxxxxxx>
Date: Tue, 15 Jan 2019 12:11:20 -0000
Reply-to: Bug 1803360 <1803360@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

** Changed in: thermald (Ubuntu Xenial)
       Status: New => Won't Fix

** Changed in: thermald (Ubuntu Xenial)
     Assignee: Colin Ian King (colin-king) => (unassigned)

** Changed in: thermald (Ubuntu Xenial)
   Importance: High => Undecided

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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:
  In Progress
Status in thermald source package in Cosmic:
  In Progress
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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