** Description changed: + == 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.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1803360 Title: Fanless systems with DPTF shutdown before using any passive cooling device To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/thermald/+bug/1803360/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
