My PWM fan is not turning on at all, not even briefly at startup. It appears that the hardware is not even detected by the system.
The fan logs in the dashboard show the following:
25/01/26 10:16:39.936 [WARNING] PWM Fan is not supported
25/01/26 10:16:39.936 [WARNING] PWM Fan init failed, disable pwm_fan control
25/01/26 11:38:08.359 [WARNING] PWM Fan is not supported
25/01/26 11:38:08.359 [WARNING] PWM Fan init failed, disable pwm_fan control
I still get “No such file or directory” when trying to check the current status of the fan.
I have already verified the physical connection, as well as version 6.6.44. I am using the official raspberry pi 5 27w power supply, as recommended.
acid@valis-iii:~ $ uname -a
Linux valis-iii 6.6.44-v8-16k+ #1789 SMP PREEMPT Mon Aug 5 15:24:18 BST 2024 aarch64 GNU/Linux
acid@valis-iii:~ $ uname -r
6.6.44-v8-16k+
acid@valis-iii:~ $ cat /sys/class/thermal/cooling_device0/cur_state
cat: /sys/class/thermal/cooling_device0/cur_state: No such file or directory
acid@valis-iii:/sys/class $ cd /sys/class/thermal
acid@valis-iii:/sys/class/thermal $ ls
thermal_zone0
acid@valis-iii:/sys/class/thermal/thermal_zone0 $ ls
available_policies k_pu subsystem trip_point_1_hyst trip_point_3_hyst type
hwmon0 mode sustainable_power trip_point_1_temp trip_point_3_temp uevent
integral_cutoff offset temp trip_point_1_type trip_point_3_type
k_d policy trip_point_0_hyst trip_point_2_hyst trip_point_4_hyst
k_i power trip_point_0_temp trip_point_2_temp trip_point_4_temp
k_po slope trip_point_0_type trip_point_2_type trip_point_4_type
acid@valis-iii:/sys/devices/platform $ ls
107c580000.hvs cam1_reg ir-receiver@d psci sd_io_1v8_reg timer
3fd165c0.nvram cam_dummy_reg kgdboc pwr_button sd_vcc_reg uevent
arm-pmu chosen leds reg-dummy serial8250 wl_on_reg
axi cpufreq-dt phy regulatory.0 snd-soc-dummy
cam0_reg 'Fixed MDIO bus.0' power rp1_vdd_3v3 soc
I have added the following config to /boot/firmware/config.txt:
# PWM_fan
dtparam=fan_temp0=40000
dtparam=fan_temp0_hyst=10000
dtparam=fan_temp0_speed=125
At this point, I believe that the fan is defective. If you have additional troubleshooting steps, I am willing to try them, but I believe that the fan unit is defective and needs to be replaced.
Please advise on how to proceed.
Thank you!