• Fan speed on my little ITX box is running loud, very loud, all the time. I'm trying to figure out how to tone it down. Here is my ACPI info:

    hw.acpi.thermal.tz0._TSP: 60
    hw.acpi.thermal.tz0._TC2: 3
    hw.acpi.thermal.tz0._TC1: 4
    hw.acpi.thermal.tz0._ACx: 100.0C -1 -1 -1 -1 -1 -1 -1 -1 -1
    hw.acpi.thermal.tz0._CRT: 100.0C
    hw.acpi.thermal.tz0._HOT: 80.0C
    hw.acpi.thermal.tz0._PSV: 25.0C
    hw.acpi.thermal.tz0.thermal_flags: 0
    hw.acpi.thermal.tz0.passive_cooling: 0
    hw.acpi.thermal.tz0.active: -1
    hw.acpi.thermal.tz0.temperature: 23.0C
    hw.acpi.thermal.user_override: 1
    hw.acpi.thermal.polling_rate: 10
    hw.acpi.thermal.min_runtime: 0

    I haven't messed with this stuff before, and have toyed with moving the _PSV value and the passive_cooling bit but nothing seems to tone down the fan. I've never seen the chip hotter than 28C, but I guess I've only started paying attention recently. Do I have the capability from the web GUI to do anything? Is there a relevant package install that may help?

    Thanks for the help.

  • Why not just incorporate a resistor in the loop?


  • I figured a software solution would be easier than modifying the actually electrical components.

  • The solution is to find and correct the root cause.  Just slowing down the fan leaves the system without the cooling it is needing.  The result of that could be anything from a dead system to a fire, or who know what.  You wouldn't disconnect the fan in your car because you don't like the noise it makes would you?

  • Your BIOS might have fan speed control options.

  • What board and what fan are you using?

    Most boards can automatically control the fan speed provided certain parameters are met.
    E.g. You may need to use a 4-wire PWM fan, and connect it to the CPU Fan header. Then activate the fan control in BIOS.