Given that the problem exist with kernel 5.13.0-19 and newer but not
with kernel 5.11.0-37, I tried to find which the change triggered this
weird behavior using git bisect. I used bisect in the range [v5.11,
v5.13] (official tags) and I've built the standard non-ubuntu kernel(s)
using:
make -j4 bindeb-pkg LOCALVERSION=-custom
As config, I used the Ubuntu one from: /boot/config-5.11.0-37-generic
and accepted all the new config options as default.
But, before finishing to test all the bisect steps, I found that even
with the first kernel, v5.11, commit:
f40ddce88593482919761f74910f42f4b84c004b, the problem already exists.
Therefore, it looks like there were some Ubuntu-specific patches in
5.11.0-37 that prevented the problem to happen. In the original v5.11
kernel, the fans spin at ~50% apparently no matter the CPU load.
Apparently, those Ubuntu patches that prevented the problem from
happening, got changed in 5.13.0-19. Does anybody have a clue what could
that be?
Thanks,
Vlad
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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
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