Apparently, fans go 100% on Ubuntu 18.04 even with 4.4.0-21-generic kernel.
I'm out of ideas...

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  CPU/GPU Fans suddenly go 100% RPM on Asus ROG G752VT

Status in linux package in Ubuntu:

Bug description:
  After upgrading from Ubuntu 16.04 to 18.04, I've noticed that CPU and
  GPU fans suddenly go full throttle. It doesn't seem to depend on
  temperature, could happen when 32 °C reported, sometimes the laptop
  can work for day or two without this issue, but eventually it happens.
  The only way to stop fans is to power off the laptop, power on (fans
  go 100% at this point again), power off during BIOS splash screen and
  power on again. Seems to happen more often after waking up from a

  Things tried:

  Upgrading BIOS to latest available on ASUS site to the date of
  writing. No change.

  asus-fan kernel module ( Detects
  both fans and shows correct speed in /sys/class/hwmon/*/fan{1,2}*, but
  does not seem to control it and does not prevent going full throttle.

  4.17.0 kernel from Ubuntu mainline builds. Doesn't seem to affect the

  Userspace fan control software (
  Can control speed of both fans to the point where they go full
  throttle, after that has no effect on them.

  ProblemType: Bug
  ApportVersion: 2.20.9-0ubuntu7.2
  Architecture: amd64
   /dev/snd/controlC1:  whale      3068 F.... pulseaudio
   /dev/snd/controlC0:  whale      3068 F.... pulseaudio
  CurrentDesktop: ubuntu:GNOME
  DistroRelease: Ubuntu 18.04
  HibernationDevice: RESUME=UUID=ada9b595-bbf2-40a3-8575-5908492bb969
  InstallationDate: Installed on 2014-10-20 (1333 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64+mac 
  NonfreeKernelModules: nvidia_modeset nvidia wl
  Package: linux (not installed)
  ProcFB: 0 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-23-generic 
root=UUID=f6509d56-6183-464c-90bb-9c3be2c8abdf ro quiet splash 
acpi_backlight=vendor vt.handoff=1
  ProcVersionSignature: Ubuntu 4.15.0-23.25-generic 4.15.18
   linux-restricted-modules-4.15.0-23-generic N/A
   linux-backports-modules-4.15.0-23-generic  N/A
   linux-firmware                             1.173.1
  Tags:  bionic
  Uname: Linux 4.15.0-23-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm audio cdrom dip docker lpadmin plugdev sambashare sudo tty 
  _MarkForUpload: True 06/29/2017
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: G752VT.304
  dmi.board.asset.tag: ATN12345678901234567 G752VT
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: ATN12345678901234567
  dmi.chassis.type: 10
  dmi.chassis.vendor: ASUSTeK COMPUTER INC.
  dmi.chassis.version: 1.0
dmi:bvnAmericanMegatrendsInc.:bvrG752VT.304:bd06/29/2017:svnASUSTeKCOMPUTERINC.:pnG752VT:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnG752VT:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0: G G752VT
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK COMPUTER INC.

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