Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: linux-signed-hwe-5.11 (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1939628
Title:
Fan goes full speed on resume from suspend (Lenovo ThinkPad T460)
Status in linux-signed-hwe-5.11 package in Ubuntu:
Confirmed
Bug description:
On resume from suspend the fan goes full speed.
Regression - this only happens intermittently on kernel 5.8.0-63, but
happens every time on kernel 5.11.0-25.
Running `sensors` after resume shows:
```
$ sensors
thinkpad-isa-0000
Adapter: ISA adapter
fan1: 4776 RPM
temp1: N/A
temp2: N/A
temp3: +0.0°C
temp4: +0.0°C
temp5: +0.0°C
temp6: +0.0°C
temp7: +0.0°C
temp8: +0.0°C
coretemp-isa-0000
Adapter: ISA adapter
Package id 0: +30.0°C (high = +100.0°C, crit = +100.0°C)
Core 0: +29.0°C (high = +100.0°C, crit = +100.0°C)
Core 1: +28.0°C (high = +100.0°C, crit = +100.0°C)
BAT0-acpi-0
Adapter: ACPI interface
in0: 11.82 V
iwlwifi_1-virtual-0
Adapter: Virtual device
temp1: +31.0°C
pch_skylake-virtual-0
Adapter: Virtual device
temp1: +29.5°C
BAT1-acpi-0
Adapter: ACPI interface
in0: 11.06 V
acpitz-acpi-0
Adapter: ACPI interface
temp1: +48.0°C (crit = +128.0°C)
```
Using kernel 5.11.0-25, `thinkpad-isa-0000 - temp1` shows a
temperature prior to suspend, then it consistently shows `N/A` after
resume.
Using kernel 5.8.0-63, `thinkpad-isa-0000 - temp1` shows a temperature
when the fan control is working normally (which fails intermittently
following suspend/resume) and shows `N/A` when it does not work.
```
$ cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=20.04
DISTRIB_CODENAME=focal
DISTRIB_DESCRIPTION="Ubuntu 20.04.3 LTS"
```
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-5.11.0-25-generic 5.11.0-25.27~20.04.1
ProcVersionSignature: Ubuntu 5.11.0-25.27~20.04.1-generic 5.11.22
Uname: Linux 5.11.0-25-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.18
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Thu Aug 12 00:47:13 2021
InstallationDate: Installed on 2020-05-02 (466 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
SourcePackage: linux-signed-hwe-5.11
UpgradeStatus: No upgrade log present (probably fresh install)
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