How can I set a speed for a certain PMW-driven fan manually? I tried LM-Sensors but there it seems the speed can be only set automatically.
this may work ... you could try to edit your
/etc/fancontrol file changing all the values for the specific pwm
MINSTART, MINSTOP, MINPWM to all the same values .. that should make it a set speed. You may have to change MAXTEMP to a very high value so it doesn't try to spin up higher then the min values. you will probably have to restart it for the changes to take effect
echo 2500 | sudo tee /sys/class/hwmon/hwmon2/fan3_min
hwmon[0-9] and fan[0-9] vary by system.
The BIOS might take over and stop this working, though.