[ltp] Re: tpfand configuration for an X200s

[Christoph Bier]

Henrique de Moraes Holschuh schrieb am 20.12.2008 15:29:

> On Sun, 07 Dec 2008, Christoph Bier wrote:
>> Henrique de Moraes Holschuh schrieb am 07.12.2008 11:43:
>> > On Sun, 07 Dec 2008, Christoph Bier wrote:
>> >> Yes. But under Linux the fan is running at temperatures at which
>> >> (right grammar?) the fan is not running under Vista. I would
>> > 
>> > I'd like a confirmation of that: a snapshot of the fan RPM and all thermal
>> > sensors in both Windows and Linux, showing a set of thermal readings that
>> > are almost the same, and the different fan speeds.
>> 
>> Thanks for your persistency! I did some testing and found that even
>> under Linux the fan stops below certain temperatures (see [1]). But
>> I can only achieve that low temperatures with an external fan! And
>> under Vista the fan stops at higher temperatures and sometimes runs
>> at comparatively low temperatures ([2]--[7])---due to hysteresis?!.
>> Actually Linux' power consumption and hysteresis seem to keep the
>> fan running even following powertops suggestions, lowest backlight
>> brightness and disabled WLAN, Bluetooth and WWAN. :-(
> 
> Well, now that Lenovo has told me they have advanced adaptative
> thermal control drivers in Windows, there is no reason to NOT believe
> they might be informing the EC that there is extra thermal control
> intelligence in the O.S, and the EC can be more liberal in the fan
> control (i.e. run the fan slower).  I don't have PROOF this is what is
> happening, of course.  But it is likely.

Are there any chances to get information from Lenovo about the
advanced drivers in Windows to achieve a similar behaviour in Linux?

Best
Christoph
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