Troubleshooting • Raspberry PI 5 Active Cooler spins at over 9200RPM when temps are around 29C

I have read though some of the other forum posts regarding issues with the active cooler. I have not found any other posts that describe the issue I am having.

The issue I am having is with one of my Raspbery PI 5 4GB with the official raspberry pi cooler installed. The fan spins at full speed all the time (over 9200rpm) even though the temperature is around 29 C.

I have tried a second official raspberry pi active cooler with the same result (spins at full speed all the time even though the temperature is around 29 C).

I have inspected the connector where the active cooler plugs into the Raspberry PI 5 and can see no bent pins or missing pins or anything like that. (This was suggested in one of the other forum posts!)

/sys/class/thermal/cooling_device0/cur_state: shows 0 (which I would understand to mean the fan should not be spinning at all, but it is!)

/sys/class/hwmon/hwmon2/pwm1 displays 0 (I think this means the fan should not be spinning at all, but it is)

/sys/class/thermal/thermal_zone0/temp shows 29250 (temperature around 29C fan should not be running!)

/sys/devices/platform/cooling_fan/hwmon/*/fan1_input shows 9250 (this shows the fan is spinning at over 9200 rpm. It should not be running at all!)

here is the output from some commands I have ran that might be useful in trouble shooting the issue.

pi@cumulusmxnew:~ $ sudo cat /sys/class/hwmon/hwmon2/pwm1
0

pi@cumulusmxnew:~ $ cat /sys/devices/platform/cooling_fan/hwmon/*/fan1_input
9250

pi@cumulusmxnew:~ $ sudo cat /sys/kernel/debug/pwm
platform/1f0009c000.pwm, 4 PWM devices
pwm-0 ((null) ): period: 0 ns duty: 0 ns polarity: normal
pwm-1 ((null) ): period: 0 ns duty: 0 ns polarity: normal
pwm-2 ((null) ): period: 0 ns duty: 0 ns polarity: normal
pwm-3 (cooling_fan ): requested period: 41566 ns duty: 0 ns polarity: inverse

platform/107d517a80.pwm, 2 PWM devices
pwm-0 ((null) ): period: 0 ns duty: 0 ns polarity: normal
pwm-1 ((null) ): period: 0 ns duty: 0 ns polarity: normal

pi@cumulusmxnew:~ $ grep -s . /sys/class/thermal/thermal_zone*/* /sys/class/thermal/cooling_device*/*
/sys/class/thermal/thermal_zone0/available_policies:step_wise
/sys/class/thermal/thermal_zone0/cdev0_trip_point:1
/sys/class/thermal/thermal_zone0/cdev0_weight:0
/sys/class/thermal/thermal_zone0/cdev1_trip_point:2
/sys/class/thermal/thermal_zone0/cdev1_weight:0
/sys/class/thermal/thermal_zone0/cdev2_trip_point:3
/sys/class/thermal/thermal_zone0/cdev2_weight:0
/sys/class/thermal/thermal_zone0/cdev3_trip_point:4
/sys/class/thermal/thermal_zone0/cdev3_weight:0
/sys/class/thermal/thermal_zone0/cdev4_trip_point:0
/sys/class/thermal/thermal_zone0/cdev4_weight:0
/sys/class/thermal/thermal_zone0/integral_cutoff:0
/sys/class/thermal/thermal_zone0/k_d:0
/sys/class/thermal/thermal_zone0/k_i:0
/sys/class/thermal/thermal_zone0/k_po:0
/sys/class/thermal/thermal_zone0/k_pu:0
/sys/class/thermal/thermal_zone0/mode:enabled
/sys/class/thermal/thermal_zone0/offset:450000
/sys/class/thermal/thermal_zone0/policy:step_wise
/sys/class/thermal/thermal_zone0/slope:-550
/sys/class/thermal/thermal_zone0/sustainable_power:0
/sys/class/thermal/thermal_zone0/temp:29250
/sys/class/thermal/thermal_zone0/trip_point_0_hyst:0
/sys/class/thermal/thermal_zone0/trip_point_0_temp:110000
/sys/class/thermal/thermal_zone0/trip_point_0_type:critical
/sys/class/thermal/thermal_zone0/trip_point_1_hyst:5000
/sys/class/thermal/thermal_zone0/trip_point_1_temp:50000
/sys/class/thermal/thermal_zone0/trip_point_1_type:active
/sys/class/thermal/thermal_zone0/trip_point_2_hyst:5000
/sys/class/thermal/thermal_zone0/trip_point_2_temp:60000
/sys/class/thermal/thermal_zone0/trip_point_2_type:active
/sys/class/thermal/thermal_zone0/trip_point_3_hyst:5000
/sys/class/thermal/thermal_zone0/trip_point_3_temp:67500
/sys/class/thermal/thermal_zone0/trip_point_3_type:active
/sys/class/thermal/thermal_zone0/trip_point_4_hyst:5000
/sys/class/thermal/thermal_zone0/trip_point_4_temp:75000
/sys/class/thermal/thermal_zone0/trip_point_4_type:active
/sys/class/thermal/thermal_zone0/type:cpu-thermal
/sys/class/thermal/cooling_device0/cur_state:0
/sys/class/thermal/cooling_device0/max_state:4
/sys/class/thermal/cooling_device0/type:pwm-fan

pi@cumulusmxnew:~ $ uname -a
Linux cumulusmxnew 6.1.0-rpi7-rpi-2712 #1 SMP PREEMPT Debian 1:6.1.63-1+rpt1 (2023-11-24) aarch64 GNU/Linux

pi@cumulusmxnew:~ $ cat /etc/os-release
PRETTY_NAME="Debian GNU/Linux 12 (bookworm)"
NAME="Debian GNU/Linux"
VERSION_ID="12"
VERSION="12 (bookworm)"
VERSION_CODENAME=bookworm
ID=debian
HOME_URL="https://www.debian.org/"
SUPPORT_URL="https://www.debian.org/support"
BUG_REPORT_URL="https://bugs.debian.org/"

Thank You,
Lance

Statistics: Posted by lgeitner — Thu Jan 18, 2024 12:05 am — Replies 0 — Views 126

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