Re: kern/43508: fan are shut down in any case if running on battery

[David DEMELIER <demelier.david%gmail.com@localhost>]

The following reply was made to PR kern/43508; it has been noted by GNATS.

From: David DEMELIER <demelier.david%gmail.com@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: kern-bug-people%netbsd.org@localhost, gnats-admin%netbsd.org@localhost, 
netbsd-bugs%netbsd.org@localhost
Subject: Re: kern/43508: fan are shut down in any case if running on battery
Date: Fri, 25 Jun 2010 09:34:09 +0200

 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 batt=
 ery
 > Date: Fri, 25 Jun 2010 07:50:50 +0300
 >
 > =C2=A0On Thu, Jun 24, 2010 at 09:50:00PM +0000, 
 > demelier.david%gmail.com@localhost =
 wrote:
 > =C2=A0> When running on AC line, everything works perfectly if I excess a=
  certain
 > =C2=A0> temperature fans will raise up. But running on battery I noticed =
 that the
 > =C2=A0> fan is completely shut down!
 > =C2=A0>
 > =C2=A0> Then I excess 100C=C2=B0 and no fan turns! It's really dangerous =
 because it
 > =C2=A0> overheats really soon and after 5-10 minutes the laptop is shut d=
 own.
 >
 > =C2=A0I need the acpidump(8) output to diagnose this further. You can ext=
 ract the
 > =C2=A0so-called DSDT table by issuing:
 >
 > =C2=A0# acpidump -o foo.dsdt > foo.asl
 >
 > =C2=A0As it is unlikely that an OEM would make such a fatal flaw, one hyp=
 othesis
 > =C2=A0could be that the system tries to use so-called "passive cooling po=
 licy"
 > =C2=A0(see acpitz(4) for discussion) when operating on batteries. This me=
 ans that
 > =C2=A0instead of using fans, it tries to lower the CPU frequencies to dea=
 l with
 > =C2=A0the heating.
 >
 > =C2=A0ACPI is under active development and the above scheme is unfortunat=
 ely not
 > =C2=A0yet supported on NetBSD.
 >
 >
 
 Sorry for the painful attachment. Here you can see the ACPI table :
 
 http://malikania.fr/hp-acpi.asl
 
 --=20
 Demelier David