High CPU temperature and high fans level

William A. Mahaffey III wam at hiwaay.net
Mon Jul 18 00:22:42 UTC 2016

On 07/17/16 10:50, Arthur Chance wrote:
> On 17/07/2016 13:48, William A. Mahaffey III wrote:
>> 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 ....
> Ditto. This is a small and old Atom based Zotac system running 10.2:
> root at zotac:0# sysctl dev.cpu|grep temperature
> dev.cpu.3.temperature: 24.0C
> dev.cpu.2.temperature: 24.0C
> dev.cpu.1.temperature: 27.0C
> dev.cpu.0.temperature: 27.0C
> The digital thermometer right next to it is reporting 33.9C in my office
> (we're having a hot spell by our standards). There's no way the CPU can
> be colder than the ambient temperature.

Word dat, my observations exactly ....


	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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