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hp ze4560 thermal problem

On Wed, 23 Jun 2004, Alexandre "Sunny" Kovalenko wrote:
> On Wed, 2004-06-23 at 12:40, Nate Lawson wrote:
> > On Wed, 23 Jun 2004, Dan Cojocar wrote:
> > > 	You said that it's possible that my fan control is done by
> > > something other than ACPI, how can i establish who is responsible with
> > > my fans?
> >
> > You defined your own custom ACPI cooling objects in your ASL.  The BIOS
> > manufacturer did not.  Therefore, on other OS's that work with the stock
> > ASL (i.e. Windows), fan control is done some other way than through ACPI.
> > Perhaps it's done via SMM.  Do the fans ever come on while running with
> > the stock ASL?  Or, it's done with a custom driver via SMbus or by
> > directly poking the super I/O chip.  You know that "power/heat/hotkey"
> > custom app that comes with just about every laptop?  That's what it's
> > doing.  If the laptop was more ACPI-compliant, the fans would be defined
> > in your ASL and you wouldn't have to use a custom ASL.
> >
> > As for your custom ASL, it sounds like you got things right.
> For whatever it worth: in my laptop fan control was safely tucked into
> RTEP. I was following the temperature reporting trail to find it there.

Just as a test, he should try this Linux app on Linux:


There's a low-priority TODO to write a similar driver for FreeBSD.  It is
apparently needed for control of HP and Toshiba Satellite laptops.