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From: Dmitry Kolosov <onyx@z-up.ru>
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Date: Thu, 20 Oct 2011 16:44:24 +0400
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Subject: Re: Battery charge limiting
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> for thinkpads, there is no need to reverse any win32 stuff.. there is a
> linux driver that accesses the EC and is able to get/set battery
> parameters (among other stuff, like HDAPS) called tp_smapi
> (http://sourceforge.net/projects/tpctl/)

Ok. It looks like not every EC capable to be controlled, there is some kind of 
active and passive ECs. How we can guess the one IS capable? May be presence 
of some ACPI methods is the symptom of such capabilities? Any suggestions?