Also tried to gather powertop-related issues for further analysis, however, wasn't able to do it completely:
1) Firstly I enabled next startup option: dyndbg="file ec.c +p ; drivers/pci/* +p". I added ACPI's ec as it might be fault reason as well. At least for some models, EmbeddedControl includes a table for fan temperatures as, for example, implemented in https://github.com/dominiksalvet/asus-fan-control Kernel messages could be found in dmesg_startup during the startup of the system. 2) Before gathering data via powertop I tried to emulate maximal speed. For me it happens when I try to editing something or opening video in the browser. dmesg_change_speed gathered for this case. 3) Finally, I tried to run powertop and... my keyboard was stuck. It happens in 100% of cases. So, what I did I run next cmd: powertop --auto-tune 2> powertop_start_err > powertop_start_out && sleep 5 && dmesg > dmesg_powertop rebooted and attached both powertop_start_err and powertop_start_out. No need to attach dmesg_powertop as it always empty. Seems accordingly to https://askubuntu.com/questions/1131279/powertop-cpufreq-stats-failed-and-devfreq-not-enabled-running-auto-tone powertop is not an appropriate utility for notebooks. Please, suggest something else. ========================================================================== My conclusion so far seems it related somehow to ACPI float regions that somehow overlap with other devices. P.S. find my system-related info for my ASUS G752VL in latest comments of https://bugzilla.kernel.org/show_bug.cgi?id=153281 -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to thermald in Ubuntu. https://bugs.launchpad.net/bugs/1775717 Title: CPU/GPU Fans suddenly go 100% RPM on Asus ROG G752VT Status in linux package in Ubuntu: Incomplete Status in thermald package in Ubuntu: Confirmed 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 sleep. Things tried: Upgrading BIOS to latest available on ASUS site to the date of writing. No change. asus-fan kernel module (https://github.com/daringer/asus-fan). 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 issue. Userspace fan control software (https://github.com/hirschmann/nbfc). 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 AudioDevicesInUse: USER PID ACCESS COMMAND /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 (20140722.2) MachineType: ASUSTeK COMPUTER INC. G752VT 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 RelatedPackageVersions: 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 video _MarkForUpload: True dmi.bios.date: 06/29/2017 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: G752VT.304 dmi.board.asset.tag: ATN12345678901234567 dmi.board.name: 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.modalias: dmi:bvnAmericanMegatrendsInc.:bvrG752VT.304:bd06/29/2017:svnASUSTeKCOMPUTERINC.:pnG752VT:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnG752VT:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0: dmi.product.family: G dmi.product.name: G752VT dmi.product.version: 1.0 dmi.sys.vendor: ASUSTeK COMPUTER INC. 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