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hp ze4560 thermal problem
- Subject: hp ze4560 thermal problem
- From: Alex.Kovalenko at verizon.net (Alexandre "Sunny" Kovalenko)
- Date: Wed Jun 23 23:43:32 2004
On Wed, 2004-06-23 at 12:40, Nate Lawson wrote:
> On Wed, 23 Jun 2004, Dan Cojocar wrote:
> > > You'll have to look at the ACPI spec if you want to decode the field
> > > values. In this case, the numbers are field widths and mean FAN is 1 bit,
> > > FANL is 16 bits wide. The spec won't tell you what FAN or FANL mean but
> > > you can sometimes figure it out from the surrounding AML. I looked at a
> > > similar ASL dump and it appears the FAN and FANL values aren't referenced
> > > elsewhere. So your fan control needs to be done by something other than
> > > ACPI.
> > >
> > > -Nate
> > I'm confused now because i defined in my asl _AC0, _AC1 and
> > their corespondent _AL0 and _AL1, and Devices for FAN, and now i can
> > change active status from -1 to 0 or 1.
> > I enabled debug and i see that my fan1 and fan2 are changing
> > status from D3 to D0 when the temperature is bigger then AC0, but i'm
> > not sure i defined correct temperatures for AC0 and AC1, because in my
> > asl they were absent, and i defined AC0 at 70C and AC1 at 65C. I don't
> > know if there values are correct, but now the fan is turned on at 65C
> > and he gets more speed at 70C but it seems that the temperature
> > is very slow decreased, maybe i'm doing something wrong here :(
> > 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?
> Please try not to top-post, it makes reading the message difficult.
> 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.
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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.
Alexandre "Sunny" Kovalenko.
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