2010/6/25 Jukka Ruohonen <jruohonen%iki.fi@localhost>: > The following reply was made to PR kern/43508; it has been noted by GNATS. > > From: Jukka Ruohonen <jruohonen%iki.fi@localhost> > To: gnats-bugs%NetBSD.org@localhost > Cc: > Subject: Re: kern/43508: fan are shut down in any case if running on battery > Date: Fri, 25 Jun 2010 07:50:50 +0300 > > ÂOn Thu, Jun 24, 2010 at 09:50:00PM +0000, demelier.david%gmail.com@localhost > wrote: > Â> When running on AC line, everything works perfectly if I excess a certain > Â> temperature fans will raise up. But running on battery I noticed that the > Â> fan is completely shut down! > Â> > Â> Then I excess 100CÂ and no fan turns! It's really dangerous because it > Â> overheats really soon and after 5-10 minutes the laptop is shut down. > > ÂI need the acpidump(8) output to diagnose this further. You can extract the > Âso-called DSDT table by issuing: > > Â# acpidump -o foo.dsdt > foo.asl > This results in a empty foo.asl, are you sure you don't mean acpidump -dt ? > ÂAs it is unlikely that an OEM would make such a fatal flaw, one hypothesis > Âcould be that the system tries to use so-called "passive cooling policy" > Â(see acpitz(4) for discussion) when operating on batteries. This means that > Âinstead of using fans, it tries to lower the CPU frequencies to deal with > Âthe heating. > Yes that's probably why I have passing cooling printed in acpitz related devices. > ÂACPI is under active development and the above scheme is unfortunately not > Âyet supported on NetBSD. > -- Demelier David
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