RE: thermal.o Linux ACPI Kernel Modul

RE: thermal.o Linux ACPI Kernel Modul

[Grover, Andrew]

> From: Daniel [mailto:Fat32-S0/GAf8tV78@public.gmane.org] 
> Hallo Andrew,
> I have a little problem getting my cpu fan to work proppably 
> with linux.
> The ACPI module you coded creates a file in the proc fa calle 
> "trip_points".
> When I cat this file I get the following:
> cat trip_points
> critical (S5):           85 C
> passive:                 95 C: tc1=2 tc2=5 tsp=300 devices=0xc12c7680
> 
> So my fan is running the hole time (sometimes slower, 
> sometimes faster, but 
> never realy stops). btw. I have a Acer 613TXC Notebook with 
> Phoenix BIOS 
> (latest version).

You will notice that your system does not have an "active" entry. This
generally means that the fan is not under ACPI's control. So, the OS
power policy can read the temp (what does your temperature read?) and
implement passive cooling (throttle the CPU) and may shut the system
down when the temp hits 85C (wow, pretty hot) but it doesn't know about
any active cooling mechanisms.

> Could you please help me with a brief answer, or tell me 
> where I can find a  
> documentation fpr this? Where gets the thermal module it's 
> data for the 
> trip_points file from?

The thermal module gets the temperature trip points from the BIOS (the
DSDT.) The thinking is that the system manufacturer knows best about the
particular thermal characteristics of a given platform. I think we added
support to override these, if it becomes necessary, however. Look at
thermal.c.

Regards -- Andy


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Re: RE: thermal.o Linux ACPI Kernel Modul

[Ducrot Bruno]

On Wed, Jan 15, 2003 at 05:19:59PM -0800, Grover, Andrew wrote:
> > From: Daniel [mailto:Fat32-S0/GAf8tV78@public.gmane.org] 
> > Hallo Andrew,
> > I have a little problem getting my cpu fan to work proppably 
> > with linux.
> > The ACPI module you coded creates a file in the proc fa calle 
> > "trip_points".
> > When I cat this file I get the following:
> > cat trip_points
> > critical (S5):           85 C
> > passive:                 95 C: tc1=2 tc2=5 tsp=300 devices=0xc12c7680
> > 
> > So my fan is running the hole time (sometimes slower, 
> > sometimes faster, but 
> > never realy stops). btw. I have a Acer 613TXC Notebook with 
> > Phoenix BIOS 
> > (latest version).
> 
> You will notice that your system does not have an "active" entry. This
> generally means that the fan is not under ACPI's control. So, the OS
> power policy can read the temp (what does your temperature read?) and
> implement passive cooling (throttle the CPU) and may shut the system
> down when the temp hits 85C (wow, pretty hot) but it doesn't know about
> any active cooling mechanisms.

passive at 95 and critical at 85 ?!  Oh my..

-- 
Ducrot Bruno

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


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Re: RE: thermal.o Linux ACPI Kernel Modul

[Pavel Machek]

Hi!

> > > cat trip_points
> > > critical (S5):           85 C
> > > passive:                 95 C: tc1=2 tc2=5 tsp=300 devices=0xc12c7680
> > > 
> 
> passive at 95 and critical at 85 ?!  Oh my..

I've seen similar crap way too often. Is there
something b0rken with Linux or are hw manufacturers
really *so* clueless?
-- 
				Pavel
Written on sharp zaurus, because my Velo1 broke. If you have Velo you don't need...



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