Re: T420 fan and Ubuntu 25.04

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On Fri, 06 Feb 2026 19:01:02 +0200, Dennis Yurichev wrote:

>Hi all!
>
>T420 + Ubuntu 24.04.2 LTS - I could write to /proc/acpi/ibm/fan
>for fan control.
>That worked.
>
>T420 + Ubuntu 25.04 - Now I get:
>
>====================================
>% cat fan_2.sh
>echo "level 2" > /proc/acpi/ibm/fan
>
>% sudo ./fan_2.sh
>./fan_2.sh: 1: echo: echo: I/O error
>====================================
>
>Known issue (after upgrading)?

Do you still have something like

# cat /etc/modprobe.d/thinkpad_acpi.conf
options thinkpad_acpi fan_control=1


Cheers,
gregor

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