Here is a quick way to manually control your fan speed on your Lenovo T410 running FreeBSD 10.x:
First load the kernel module:
$ kldload acpi_ibm.ko
Then check your new sysctl’s:
$ sysctl -a | grep -i fan
Turn on manual mode:
$ sysctl dev.acpi_ibm.0.fan=0
Set fan for instance, to level 7:
$ dev.acpi_ibm.0.fan_level: 7
The man page for acpi_ibm.ko details the different levels:
dev.acpi_ibm.0.fan_level Indicates at what speed the fan should run when being in manual mode. Values are ranging from 0 (off) to 7 (max). The resulting speed differs from model to model. On a T41p this is as follows: 0 off 1, 2 ~3000 RPM 3, 4, 5 ~3600 RPM 6, 7 ~4300 RPM
It appears that my max speed is 4527 RPM.
You can check your temperature using
$ sysctl -a|grep temperature
FYI, mine shows 93.0C (!) right now cause this business laptop is utterly s**t since they put the inlet for air next to the air outlet. Really Genious. At least it helps a little to lower the CPU frequency using powerd.