HP Pavilion zt3240ea and thermal zone

HP Pavilion zt3240ea and thermal zone

[Luís Neves]

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Hi!

I recently bought this laptop and so far it seems to have ACPI working 
pretty well, at least what I expected to work, except for the absence of 
  anything under /proc/acpi/thermal_zone.

Is it normal that this kind of machine (a 1.6GHz centrino) do not have a 
thermal zone? I don't find thermal information under XP also but in my 
ignorance I thought this should exist.

My first attempt was to dissassemble, correct and override the DSDT but 
the single bug found and corrected (a common ByteAccess type) didn't 
change anything.

I've tested it with Debian kernels 2.6.3 to 2.6.8. Never tried yet a 
recent acpi patch as I found no evidence that it would change anything 
in this regard.

Can anyone give me a clue on this?. I attach my dsdt in case anyone 
would like to look at it.

Best regards,

Luís Neves

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Re: HP Pavilion zt3240ea and thermal zone

[Pedro Venda]

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Hash: SHA1

hello luis,

| Is it normal that this kind of machine (a 1.6GHz centrino) do not have a
| thermal zone? I don't find thermal information under XP also but in my
| ignorance I thought this should exist.
|
| My first attempt was to dissassemble, correct and override the DSDT but
| the single bug found and corrected (a common ByteAccess type) didn't
| change anything.

the hardware/software acpi implementation on your laptop is independent
of the platform, whether it is centrino or other.

after inspection of your dsdt i didn't find references to any thermal zones.

for example, page 287 of the acpi specificatoin 2.0c states that every
thermal zone MUST have a _TMP object. there is no _TMP object on your
dsdt, so i deduct one of two things:
1. your acpi code is not compliant with the standard
or
2. you really don't have thermal zones.

since there are no _CRT, _HOT, _ALx, _PSL, _PSV, _SCP, _TMP, _TZD, _TZP
and unless there is/are other place/places where thermal zones are
defined, i conclude that you don't have thermal zones defined.

maybe someone else could confirm this...

is that odd? i don't know... i am just learning ACPI now, so i don't
have the experience.

cumprimentos,
pedro venda.
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Re: HP Pavilion zt3240ea and thermal zone

[Nate Lawson]

Pedro Venda wrote:
> | Is it normal that this kind of machine (a 1.6GHz centrino) do not have a
> | thermal zone? I don't find thermal information under XP also but in my
> | ignorance I thought this should exist.
> |
> | My first attempt was to dissassemble, correct and override the DSDT but
> | the single bug found and corrected (a common ByteAccess type) didn't
> | change anything.
> 
> the hardware/software acpi implementation on your laptop is independent
> of the platform, whether it is centrino or other.
> 
> after inspection of your dsdt i didn't find references to any thermal 
> zones.
> 
> for example, page 287 of the acpi specificatoin 2.0c states that every
> thermal zone MUST have a _TMP object. there is no _TMP object on your
> dsdt, so i deduct one of two things:
> 1. your acpi code is not compliant with the standard
> or
> 2. you really don't have thermal zones.
> 
> since there are no _CRT, _HOT, _ALx, _PSL, _PSV, _SCP, _TMP, _TZD, _TZP
> and unless there is/are other place/places where thermal zones are
> defined, i conclude that you don't have thermal zones defined.
> 
> maybe someone else could confirm this...
> 
> is that odd? i don't know... i am just learning ACPI now, so i don't
> have the experience.

If you don't have a ThermalZone object, you don't have thermal zones. 
It's quite common -- it means that the BIOS will handle fans independent 
of the OS or ACPI.

-- 
Nate


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Re: HP Pavilion zt3240ea and thermal zone

[Bruno Ducrot]

On Tue, Oct 12, 2004 at 10:04:00AM -0700, Nate Lawson wrote:
> Pedro Venda wrote:
> >| Is it normal that this kind of machine (a 1.6GHz centrino) do not have a
> >| thermal zone? I don't find thermal information under XP also but in my
> >| ignorance I thought this should exist.
> >|
> >| My first attempt was to dissassemble, correct and override the DSDT but
> >| the single bug found and corrected (a common ByteAccess type) didn't
> >| change anything.
> >
> >the hardware/software acpi implementation on your laptop is independent
> >of the platform, whether it is centrino or other.
> >
> >after inspection of your dsdt i didn't find references to any thermal 
> >zones.
> >
> >for example, page 287 of the acpi specificatoin 2.0c states that every
> >thermal zone MUST have a _TMP object. there is no _TMP object on your
> >dsdt, so i deduct one of two things:
> >1. your acpi code is not compliant with the standard
> >or
> >2. you really don't have thermal zones.
> >
> >since there are no _CRT, _HOT, _ALx, _PSL, _PSV, _SCP, _TMP, _TZD, _TZP
> >and unless there is/are other place/places where thermal zones are
> >defined, i conclude that you don't have thermal zones defined.
> >
> >maybe someone else could confirm this...
> >
> >is that odd? i don't know... i am just learning ACPI now, so i don't
> >have the experience.
> 
> If you don't have a ThermalZone object, you don't have thermal zones. 
> It's quite common -- it means that the BIOS will handle fans independent 
> of the OS or ACPI.

Or that a thermal sensor will handle that OK already..

Anyway, there is a CTMP in the EC space which may be actually the
temperature of the CPU likely..  I guess you may try something I wroten
for one laptop some years ago which worked for me.

You may try then to add some passive cooling stuff after if that work,
etc.


--- hp_pavilion_zt3240ea_dsdt.dsl	2004/10/13 12:15:12	1.1
+++ hp_pavilion_zt3240ea_dsdt.dsl	2004/10/13 12:27:51
@@ -2596,6 +2596,22 @@ DefinitionBlock ("DSDT.aml", "DSDT", 1, 
                     }
                 }
 
+		ThermalZone (THM0) {
+			Method (_CRT, 0, NotSerialized) {
+				Return(0xe30)	/* 100 C */
+			}
+			Method (_TMP, 0, NotSerialized) {
+				If(\_SB.C046.C059.C0EA.C0ED) {
+					Store(\_SB.C046.C059.C0EA.CTMP, Local0)
+					Multiply(Local0, 10, Local0)
+					Add(Local0, 2732, Local0)
+					Return(Local0)
+				} Else {
+					Return(0xBAD)	/* 26C */
+				}
+			}
+		}
+
                 Device (C140)
                 {
                     Name (_HID, EisaId ("WEC0518"))



Cheers,

-- 
Bruno Ducrot

--  Which is worse:  ignorance or apathy?
--  Don't know.  Don't care.


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