linux-kernel - Re: thermal_zone trip_point_0

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Date:	Wed, 20 Jun 2012 14:54:45 +0800
From:	Zhang Rui <rui.zhang@...el.com>
To:	Mark <markieb.lists.20090330@...il.com>
Cc:	Clemens Ladisch <clemens@...isch.de>, linux-kernel@...r.kernel.org
Subject: Re: thermal_zone trip_point_0_temp 200°C

On 五, 2012-06-15 at 10:42 -0400, Mark wrote:
> Hi Rui,
> 
> thanks for writing; apologies for the delay I've been coping with some bizarre
> communications from AMD who won't even state thermal specifications for the cpu,
> while 'passing the buck' to Acer who are slippery customers — various methods of
> avoiding giving technical support worthy of the name — too :-)
> 
> On 06/05/2012 09:54 PM, Zhang Rui wrote:
> > you can use module parameter thermal.crt= to override the critical trip
> > point.
> > But I'm not sure if kernel should set a default upper limit or not.
> > Maybe we need another entry for this laptop in thermal_dmi_table.
> thanks, sounds worth a try; at least to prevent a fire :-D
> >
> >> there are 2-3 symbols in the ACPI that may be relevant, FANG, FANW, possibly
> >> FANU; I attach the relevant files
> > FANG/FANW/FANU can be used for fan control?
> > I do not know what these mean as they are not ACPI pre-defined control
> > method.
> > But if all the Aspires machines follow the same rule, then maybe we need
> > a kernel Acer platform driver that handles this.
> I'm simply conjecturing for now, that the letters 'FAN' may be relevant, you're
> the specialist though :-)

No, I only cares about the ACPI pre-defined control methods, which means
their behaviors have been defined in ACPI spec.
Actually, platforms can write whatever AML code, use whatever names, for
their own purpose. so I know nothing more than you on this.

> > thanks,
> > rui
> AMD suggested a channel that would seem designed more for people whose Email
> address is '@...r.com' / '@...nel.org', possibly '@...el.com' than people such as
> me '@...il.com' :-D
> 
> http://support.amd.com/us/contacts/Pages/EmbeddedTechnicalSupport.aspx
> 
> My question would be, what *is* the thermal range for the Phenom II N970 Mobile
> CPU, reference HMN970DCR42GM ?
> conspicuously absent from http://products.amd.com/en-us/NotebookCPUDetail.aspx?id=733
> 
Sorry, I do not know. I can not help you on this. :(

thanks,
rui

> Aside from the question of whether they've got some technical contact at Acer who
> could verify how — presumably some hardware registers that are somehow accessible
> to the OS — windows seems to manage to keep the CPU relatively cool / fan
> management in the Aspire 5552-7260
> 
> Best regards
> 
> Mark
> 


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