openbsd get really hot/warm

hd99

hello

unfortunately since a week I was wondering about something :
on two old hp elitebook, it looks like under win7 and linux/LMDE, that at a general glance everything looks correct
but on openbsd, something happens, even if CPU is not high : it's a huge overheating, with fans going almost everytime in the high speed, and lower case of the laptop, almost burning (in a way it's really warm, impossible to get it a minute on laps)

I saw the same problem on an asus laptop.

is there anyway to know where it come from?
under win7 and linux, this problem doesnt happens. It's really strange.

thak you for ideas 🙂

rvp

hd99 See if running apmd in /etc/rc.conf.local helps.

CiotBSD

Install obsdfreqd…

TLDR:

# pkg_add obsdfreqd
# rcctl stop apmd
# rcctl enable obsdfreqd
# rcctl set apmd flags -L
# rcctl start apmd obsdfreqd

See the page project on: https://tildegit.org/solene/obsdfreqd/

CiotBSD

rvp See if running apmd in /etc/rc.conf.local helps.

Well. Better using rc tool:
# rcctl check apmd

But OpenBSD is known for this problem… obsdfreqd helps to resolve really this!

rvp

CiotBSD obsdfreqd helps to resolve really this!

Hmm. apmd with the -A flag should do the same thing, but, I see that on AC power, it doesn't dial the CPU frequency (sysctl hw.sensors) down all the way. Only on battery power does it drop down to 800Mhz (the lowest for my CPU). On AC, it hovers around 1.4Ghz (max is 1.8 GHz). In any case, the CPU temp. is ~ 6 - 7 C cooler...

CiotBSD

Yes, apmd with the -A flag should do… but he doesn't, or at least not properly.
solene@ explains the reasons for this obsdfreqd project 😉
which is officially working since OpenBSD 7.1.