Public bug reported:
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
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug impish
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https://bugs.launchpad.net/bugs/1947614
Title:
Laptop fans spin at ~50% w/o CPU load with kernel 5.13
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