https://bugzilla.kernel.org/show_bug.cgi?id=210457
Bug ID: 210457
Summary: Fan sporadically maxed on wake-up due to unavailable
sensor temperature
Product: ACPI
Version: 2.5
Kernel Version: 5.4.0-53-generic
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Power-Thermal
Assignee: acpi_power-ther...@kernel-bugs.osdl.org
Reporter: pter...@gmail.com
Regression: No
I'm running Kubuntu on my Lenovo ThinkPad X1 Carbon (4th generation). Since a
recent upgrade to 20.04 LTS, I have the following problem.
Upon wake-up from standby the laptop's fan is sporadically set on max speed
(around 7000 RPM) regardless of the actual CPU load. It helps to put the laptop
to sleep and wake it up again. Then there is a chance the fan will react
normally to CPU load and temperature.
Running sensors when the fan is maxed, I get the following:
$ sensors
iwlwifi_1-virtual-0
Adapter: Virtual device
temp1: +35.0°C
pch_skylake-virtual-0
Adapter: Virtual device
temp1: +42.5°C
BAT0-acpi-0
Adapter: ACPI interface
in0: 16.97 V
thinkpad-isa-0000
Adapter: ISA adapter
fan1: 6932 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
temp9: +0.0°C
temp10: +1.0°C
temp11: +0.0°C
temp12: +0.0°C
temp13: +0.0°C
temp14: +0.0°C
temp15: +0.0°C
temp16: +0.0°C
coretemp-isa-0000
Adapter: ISA adapter
Package id 0: +43.0°C (high = +100.0°C, crit = +100.0°C)
Core 0: +42.0°C (high = +100.0°C, crit = +100.0°C)
Core 1: +43.0°C (high = +100.0°C, crit = +100.0°C)
acpitz-acpi-0
Adapter: ACPI interface
temp1: +48.0°C (crit = +128.0°C)
And running it when the fan behaves normally, i.e. in accordance with the CPU
load, I notice that temp1 is no longer N/A but has a value.
...
thinkpad-isa-0000
Adapter: ISA adapter
fan1: 3240 RPM
temp1: +46.0°C
temp2: N/A
...
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