[Bug]: Fan pwm stopped working on Odroid HC4

[TheWorldOfCode]

What happened?

I have three identical Odroid HC 4 which has been running the same software and using the kernel 6.12.32-current-meson64. Their are configured as NAS where the data is split across all three devices and therefore their are running constantly. A couple of weeks ago began the fan on one of the machines behavior different. It would either be running a full speed or no running, it was no longer possible to control via PWM. Now last week did another one start with the same behavior.

I was do the following to test and validate the issue:

• I have disable the fancontrol service and manually written to hwmon2/pwm1 to set the PWM. Which was possible on the healthy HC4, but on the unhealthy HC4 would it only be full speed or no speed.
• I have tried the latest version of Armbian Noble and Trixie the hwmon2/pwm1 is exposed but doesn't allow me to modify the speed of the fan.
• I have tried the official os image from Hardkernel and here does the fan work as expected.

How to reproduce?

I have just installed the newest version of Armbian Ubuntu 24.04 Noble.

The logs https://paste.armbian.com/xusabacije

On which OS are you observing this problem? (for easier diagnosis please provide logs with armbianmonitor -u)

Armbian Ubuntu 24.04 Noble

Code of Conduct

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[igorpecovnik]

HW feature problems - and this is a typical one - is best to resolve on forums https://forum.armbian.com/forum/88-amlogic-meson/

I am sure fan worked at Armbian at some point but new kernels always breaks some functionality. Hardkernel stock OS does not update kernel so nothing is ever lost ... Its a trade.

[TheWorldOfCode]

Thank you for the response I will post it on the forum instead https://forum.armbian.com/topic/59136-fan-pwm-stopped-working-on-odroid-hc4/