On Sun, Jan 12, 2014 at 05:29:02PM +0100, John Rogers wrote: > Hi. > > I have installed OpenBSD 5.4 on a laptop. So far everything runs fine > but I have the problem that it runs fairly hot even in idle. > > I used to run FreeBSD on it before and it behaved very similar then, > until I read [1]. Setting performance_cx_lowest="C2" and > economy_cx_lowest="C2" did wonder to this machine and effectively > lowered the temperature and fan speed to acceptable levels. My > understanding is that this uses ACPI to make the processor run in at > least C2 state which makes it wake up somewhat slower but in general > decreases power usage. > > My question is if I can do something similar with OpenBSD. I've read > through the source code to acpicpu(4) [2] and it mentions c-states > here and there, but I'm not used to the OpenBSD kernel source code and > is unable to tell how I can utilize it. > > John > > > [1] https://wiki.freebsd.org/TuningPowerConsumption > [2] http://www.openbsd.org/cgi-bin/cvsweb/src/sys/dev/acpi/acpicpu.c?rev=HEAD >
Try apmd(8). -- Juan Francisco Cantero Hurtado http://juanfra.info
