CPU averages:
   5.3.0-19:  2.03W, 99.6% idle, 0.1% in kernel, 93.5% in C10 state, 5.3% in C8 
state, 1.66GHz 
   5.3.0-23: 13.71W, 99.3% idle, 0.1% in kernel, 92.3% in C10 state, 6.1% in C8 
state, 2.05GHz

GPU averages:
   5.3.0-19:  0.10W
   5.3.0-23:  7.19W

ACPI thermal zone:
   5.3.0-19:  38.92 C  68.65 C

So, not much difference in CPU loading or in C10/C8 states, but it is
clocked faster on the -23 kernel and is 11.7W more power being consumed.
The GPU is also consuming far more power in the -23 kernel. The ACPI
thermal zone is ~30 degrees hotter, hence the fan activity.

Given the kernel changes I provided made no changes, this looks like a
i915 regression somehow. I'll see what has changed there.

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Packages, which is subscribed to linux in Ubuntu.

  5.3.0-23-generic causes fans to spin when idle

Status in linux package in Ubuntu:

Bug description:
  After upgrading to 5.3.0-23-generic the fans in my machine don't stop
  running. They always sound like something is utilizing CPU - even with
  no applications running after boot.

  If I boot back to 5.3.0-19-generic it's fine.

  My microcode version is reported as 0xd4 and iucode-tool reports:

  iucode-tool: system has processor(s) with signature 0x000506e3

  Let me know if you need anything else.

  ProblemType: Bug
  DistroRelease: Ubuntu 19.10
  Package: linux-image-5.3.0-23-generic 5.3.0-23.25
  ProcVersionSignature: Ubuntu 5.3.0-23.25-generic 5.3.7
  Uname: Linux 5.3.0-23-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu8.2
  Architecture: amd64
   /dev/snd/controlC2:  dean       2898 F.... pulseaudio
   /dev/snd/pcmC2D0p:   dean       2898 F...m pulseaudio
   /dev/snd/controlC0:  dean       2898 F.... pulseaudio
   /dev/snd/controlC1:  dean       2898 F.... pulseaudio
  CurrentDesktop: ubuntu:GNOME
  Date: Mon Nov 18 13:03:34 2019
  HibernationDevice: RESUME=UUID=55a42c82-50bf-4e75-a133-dbd3aa93611b
  InstallationDate: Installed on 2018-07-24 (482 days ago)
  InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 
   PATH=(custom, no user)
  ProcFB: 0 i915drmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.3.0-23-generic 
root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
   linux-restricted-modules-5.3.0-23-generic N/A
   linux-backports-modules-5.3.0-23-generic  N/A
   linux-firmware                            1.183.2
  SourcePackage: linux
  UpgradeStatus: Upgraded to eoan on 2019-07-19 (121 days ago)
  dmi.bios.date: 05/16/2018
  dmi.bios.vendor: Intel Corp.
  dmi.bios.version: KYSKLi70.86A.0055.2018.0516.1629
  dmi.board.name: NUC6i7KYB
  dmi.board.vendor: Intel Corporation
  dmi.board.version: H90766-406
  dmi.chassis.type: 3
  dmi.chassis.vendor: Intel Corporation
  dmi.chassis.version: 1.0

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