High CPU temperature and high fans level

David Demelier demelier.david at gmail.com
Sun Jul 17 09:59:35 UTC 2016

2016-07-17 0:25 GMT+02:00 Polytropon <freebsd at edvax.de>:
> On Sun, 17 Jul 2016 00:06:07 +0200, David Demelier wrote:
>> Hello,
>> I was trying FreeBSD 10.3 on my laptop (hp probook 4510s) and was surprised
>> to see high CPU temperature and fans running high.
>> No apps running, I get a temperature of 57C in dev.cpu.x.temperature and
>> fans run high (not able to get rpms).
>> On a 4.6.3 Linux distro I get an average of 48C and fans are quite low.
>> Both tests were kept in tty. No Xorg running just a boot and user login in
>> console.
>> Do you have any clue?
> Did you enable powerd? It can slow down the CPU when the system
> is idle, and increase the CPU speed when needed. This should have
> an effect on CPU temperature and fan speed.

Yes, I had powerd enabled, I tried -a adaptive, -a hiadaptive as
suggested by Erich but it seems that only -a min has some little
effect. I could get a temperature of 52C. I've tested back on Linux
and I got an average much lower (41C).

By the way the other sensors in hw.acpi.tz* are also much higher than
Linux (using lm_sensors). The highest value is my tz5 which is at 78C
almost 5 seconds after boot while the maximum tz value in Linux
sensors is 55.

I have no idea what's wrong. :(

Demelier David

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