High CPU temperature and high fans level

William A. Mahaffey III wam at hiwaay.net
Sun Jul 17 12:49:54 UTC 2016

On 07/17/16 05:05, David Demelier wrote:
> 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. :(

I have had issues w/ FreeBSD apparently not reporting accurate temps on 
this box, AMD jaguar desktop, FreeBSD 9.3R. YMMV & all that rot ....


	William A. Mahaffey III


	"The M1 Garand is without doubt the finest implement of war
	 ever devised by man."
                            -- Gen. George S. Patton Jr.

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