DragonFly BSD
DragonFly kernel List (threaded) for 2003-12
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Re: Laptop getting hot

From: YONETANI Tomokazu <qhwt+dragonfly-kernel@xxxxxxxxxx>
Date: Tue, 30 Dec 2003 08:56:28 +0900


On Mon, Dec 29, 2003 at 11:07:58AM -0800, Matthew Dillon wrote:
> :> > I had neither apm nor acpi enabled and the fan did not turn on 
> :> > at all. With DFBSD it start almost immediately, even without any load.
> :> > Do you have any idea, what could be causing this?
> :> 
> :> Same thing happens to me with Dell Optiplex G240(a Desktop, though).
> :> When it's running FreeBSD-stable, the cooling fan is very calm, while with
> :> DragonFly the fan keeps turning noisily as if it's running buildworld.
> :> I haven't tried recent acpi code from FreeBSD-CURRENT, but it doesn't seem
> :> to have any CPU throttling feature.
> :
> :I found that DragonFly box produces less heat when it's playing
> :some music with mpg321 from ports.
> :
> :I did the following experiment with my Dynabook:
>     I'm not sure what's going on... it should be in a halted state most
>     of the time (i.e. 'hlt' instruction), unless there is something cpu
>     bound running.

Speaking of 'hlt' instruction, if I revert the revision 1.22 of
sys/kern/lwkt_thread.c, the temperature stays low.

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