** Tags added: kernel-bug kernel-therm ** Tags removed: kernel-bug
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1947614 Title: Laptop fans spin at ~50% w/o CPU load with kernel 5.13 Status in linux package in Ubuntu: Confirmed Bug description: After upgrading from Ubuntu 21.04 to Ubuntu 21.10 a few days ago, I noticed that the fans of my laptop (Lenovo ideapad 700-15ISK) were spinning all the time at about ~50%, no matter the CPU load. I forced all my cores to run at 100% with a simple while(1) loop to see if the fan speed would increase but nothing. Apparently, no matter the CPU load and temperature, with kernel 5.13.0-19 the fans of my laptop spin at the same RPM. From their noise, I believe that's about 50%. Therefore, I decided to boot the same Ubuntu 21.10 with the older kernel 5.11.0-37 and the problem disappeared. Looks like in the newer kernel there is a problem with the control of fans for my HW. To complete the picture, I built and booted kernel v5.15-rc5 to see if with a bleeding edge kernel the problem would disappear: it didn't. Therefore, the problem appears to be introduced somewhere between kernel 5.11 and kernel 5.13. The output of `sensors`, unfortunately doesn't show any fans and that's the same no matter the kernel version: pch_skylake-virtual-0 Adapter: Virtual device temp1: +54.5°C BAT0-acpi-0 Adapter: ACPI interface in0: 12.25 V coretemp-isa-0000 Adapter: ISA adapter Package id 0: +39.0°C (high = +100.0°C, crit = +100.0°C) Core 0: +37.0°C (high = +100.0°C, crit = +100.0°C) Core 1: +38.0°C (high = +100.0°C, crit = +100.0°C) Core 2: +39.0°C (high = +100.0°C, crit = +100.0°C) Core 3: +38.0°C (high = +100.0°C, crit = +100.0°C) acpitz-acpi-0 Adapter: ACPI interface temp1: +39.0°C (crit = +99.0°C) temp2: +42.0°C (crit = +85.0°C) ProblemType: Bug DistroRelease: Ubuntu 21.10 Package: linux-image-5.13.0-19-generic 5.13.0-19.19 ProcVersionSignature: Ubuntu 5.13.0-19.19-generic 5.13.14 Uname: Linux 5.13.0-19-generic x86_64 NonfreeKernelModules: nvidia_modeset nvidia ApportVersion: 2.20.11-0ubuntu70 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: vlad 5972 F.... pulseaudio /dev/snd/controlC0: vlad 5972 F.... pulseaudio CasperMD5CheckResult: unknown CurrentDesktop: ubuntu:GNOME Date: Mon Oct 18 19:04:03 2021 InstallationDate: Installed on 2020-03-17 (579 days ago) InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017) MachineType: LENOVO 80RU ProcFB: 0 i915drmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.13.0-19-generic root=UUID=0e855d19-79da-402d-9586-b7bfe9a9622a ro RelatedPackageVersions: linux-restricted-modules-5.13.0-19-generic N/A linux-backports-modules-5.13.0-19-generic N/A linux-firmware 1.201 SourcePackage: linux UpgradeStatus: Upgraded to impish on 2021-10-16 (1 days ago) dmi.bios.date: 08/09/2017 dmi.bios.release: 1.61 dmi.bios.vendor: LENOVO dmi.bios.version: E5CN61WW dmi.board.asset.tag: No Asset Tag dmi.board.name: Lenovo ideapad 700-15ISK dmi.board.vendor: LENOVO dmi.board.version: NO DPK dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: Lenovo ideapad 700-15ISK dmi.ec.firmware.release: 1.22 dmi.modalias: dmi:bvnLENOVO:bvrE5CN61WW:bd08/09/2017:br1.61:efr1.22:svnLENOVO:pn80RU:pvrLenovoideapad700-15ISK:skuLENOVO_MT_80RU_BU_idea_FM_Lenovoideapad700-15ISK:rvnLENOVO:rnLenovoideapad700-15ISK:rvrNODPK:cvnLENOVO:ct10:cvrLenovoideapad700-15ISK: dmi.product.family: IDEAPAD dmi.product.name: 80RU dmi.product.sku: LENOVO_MT_80RU_BU_idea_FM_Lenovo ideapad 700-15ISK dmi.product.version: Lenovo ideapad 700-15ISK dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1947614/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
