Fanless systems with DPTF shutdown before using any passive cooling device

[Kai-Heng Feng]

== 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.

[Kai-Heng Feng (kaihengfeng)]

Thermald PR:
https://github.com/intel/thermal_daemon/pull/171

[Colin Ian King (colin-king)]

Pending on what upstream says about this fix.

[Kai-Heng Feng (kaihengfeng)]

@cking,

The PR is now merged, please backport it to Ubuntu's thermald.

Thanks!

[Colin Ian King (colin-king)]

OK, will sort that out this week.

[Launchpad Janitor (janitor)]

This bug was fixed in the package thermald - 1.8.0-1ubuntu1

---------------
thermald (1.8.0-1ubuntu1) disco; 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 fix:
     - 97976782dd26 Honor ACPI _CRT for processor thermal zone

 -- Colin King <email address hidden> Mon, 14 Jan 2019 23:29:41 +0000

[Colin Ian King (colin-king)]

The xenial version of thermald does not support the INT340X, so I'm reluctant to back port the fix as I need to add the INT340X support in which is quite a few changes. As this is adding extra functionality to thermald I believe this falls outside the remit of a SRU.

[Kai-Heng Feng (kaihengfeng)]

Ok, then we can leave Xenial out.

[Brian Murray (brian-murray)]

Hello Kai-Heng, or anyone else affected,

Accepted thermald into cosmic-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/thermald/1.7.0-8ubuntu1 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested and change the tag from verification-needed-cosmic to verification-done-cosmic. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed-cosmic. In either case, without details of your testing we will not be able to proceed.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance for helping!

N.B. The updated package will be released to -updates after the bug(s) fixed by this package have been verified and the package has been in -proposed for a minimum of 7 days.

[Brian Murray (brian-murray)]

Hello Kai-Heng, or anyone else affected,

Accepted thermald into bionic-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/thermald/1.7.0-5ubuntu2 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested and change the tag from verification-needed-bionic to verification-done-bionic. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed-bionic. In either case, without details of your testing we will not be able to proceed.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance for helping!

N.B. The updated package will be released to -updates after the bug(s) fixed by this package have been verified and the package has been in -proposed for a minimum of 7 days.

[Colin Ian King (colin-king)]

@Kai-Heng,

do you mind giving these packages a test now?

Thanks.

[Alex Tu (alextu)]

verified on LNG5-DVT1-C2 for bionic , it works as expected.
image: X36
BIOS:0.5.4
package: thermald 1.7.0-5ubuntu2

[Colin Ian King (colin-king)]

@Alex, I don't have the H/W to verify this update for xenial. Do you mind testing it for Xenial too so I can get this released? Thanks!

[Colin Ian King (colin-king)]

@Alex, ignore the message in comment #12, I meant to ask you to test it for Cosmic. That would be really helpful. Thanks!

[Launchpad Janitor (janitor)]

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 <email address hidden> Mon, 14 Jan 2019 23:29:41 +0000

[Adam Conrad (adconrad)]

The verification of the Stable Release Update for thermald has completed successfully and the package has now been released to -updates. Subsequently, the Ubuntu Stable Release Updates Team is being unsubscribed and will not receive messages about this bug report. In the event that you encounter a regression using the package from -updates please report a new bug using ubuntu-bug and tag the bug report regression-update so we can easily find any regressions.

[Colin Ian King (colin-king)]

I see that the verification-done-cosmic tag has been set, I'll also set the verification-done tag too

[Launchpad Janitor (janitor)]

This bug was fixed in the package thermald - 1.7.0-8ubuntu1

---------------
thermald (1.7.0-8ubuntu1) cosmic; 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 <email address hidden> Mon, 14 Jan 2019 23:29:41 +0000