2013/1/29 Andriy Samsonyuk <andriy.samson...@ch.tum.de>: > Hi, > > is apm/apmd the only wat to change the fan speen? > > The fan speen never goes above: > hw.sensors.acpithinkpad0.fan0=4527 RPM > +- few RPMs > > if i set apmd -C or -A the laptop powers off after a while > without any warnings. > > with apm -L or -H its running, but getting hotter. > > Any suggestions/ideas?
David Coppa already sent you a patch but probably I should clarify some things more. Many modern ThinkPad allow to either delegate management of fan speed to BIOS or to set it manually. OpenBSD point of view is that manual setting fans from userland is a BAD idea. So what's the patch mentioned does is taking management from BIOS to OS. BIOS does a good thing at managing fan speed until it gets too hot. But when overheating happens, there are two complimentary ways to handle the situation: a) raise the fan speed; b) lower CPU speed. (a) is what OpenBSD with the patch mentioned starts to do. The fan is put in so called "disengaged" mode, fan goes to 6000+ RPM and became spinning as if it's trying to make your laptop flying. This probably could damage the fan, but mine is still there for about two years. The same functionality exists in the Linux kernel but the code is (was? Didn't check for a year) disabled; I've actually picked up register addresses from there. (b) is what Windows does. Your videoplayer will start dropping frames but it'll be more or less quiet around. Probably some overheating logic could be added to apmd(8), but this daemon already wants too many options and thus probably needs refactoring. Or there could be some default scripts for sensorsd(8) written... -- WBR, Vadim Zhukov
