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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