[Bug 1811730] Re: Thermald does not set max CPU after reseting the voltage using RAPL

[Anthony Wong]

** Also affects: thermald (Ubuntu Bionic)
   Importance: Undecided
       Status: New

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Title:
  Thermald does not set max CPU after reseting the voltage using RAPL

Status in thermald package in Ubuntu:
  Confirmed
Status in thermald source package in Bionic:
  New

Bug description:
  Hi,

  I was using Ubuntu 18.10 thermald package, but I noted that, after few
  seconds at max CPU usage (max temp), thermald send the signal to RALP
  to reduce the voltage of the CPU. It set the freq to minimum (800MHz
  in my case). But when the CPU is idle and temp is lowered (35-40ºC) it
  did not send the signal to resume normal operation of the CPU.

  I compiled the latest version of thermald from git
  (https://github.com/intel/thermal_daemon) and now everything works
  fine.

  I started to thought that the problem was the hardware or BIOS
  problem, as I disabled the CPU scaling on the BIOS, but intel_pstate
  continued doing freq scaling (I think for Turbo mode).

  But the real problem was Thermald. The latest version from git works
  really fine and it automatically disables and enable the Intel Turbo
  state and balance the freqs and fan control fine.

  My hardware is a Lenovo Thinkpad P52 with i7-8850H.

  I tested it using Ubuntu kernel and Kernel 4.20 optimized for i7
  processor but with Ubuntu default config (except processor
  family="Core2/newer Xeon", Preemption Model="Preemptible Kernel (Low-
  Latency Desktop)" and Timer frequency="1000HZ". (Only changed those
  settings from make oldconfig and make deb-pkg).

  ProblemType: Bug
  DistroRelease: Ubuntu 18.10
  Package: thermald (not installed)
  ProcVersionSignature: Ubuntu 4.18.0-13.14-generic 4.18.17
  Uname: Linux 4.18.0-13-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.10-0ubuntu13.1
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Mon Jan 14 23:45:01 2019
  InstallationDate: Installed on 2018-12-11 (34 days ago)
  InstallationMedia: Ubuntu 18.10 "Cosmic Cuttlefish" - Release amd64 (20181017.3)
  SourcePackage: thermald
  UpgradeStatus: No upgrade log present (probably fresh install)

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