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

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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)

** Affects: thermald (Ubuntu)
     Importance: High
     Assignee: Colin Ian King (colin-king)
         Status: Confirmed


** Tags: amd64 apport-bug cosmic patch
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Thermald does not set max CPU after reseting the voltage using RAPL
https://bugs.launchpad.net/bugs/1811730
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