From mboxrd@z Thu Jan  1 00:00:00 1970
From: Paul Bolle <pebolle@tiscali.nl>
Subject: Re: ACPI / dock: ThinkPad X220: \_SB_.PCI0.LPC_.EC__.BAT1: Unable
 to dock!
Date: Wed, 13 Aug 2014 13:49:10 +0200
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To: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Len Brown <lenb@kernel.org>, Rubin Abdi <rubin@starset.net>, linux-acpi@vger.kernel.org, linux-thinkpad@linux-thinkpad.org

On Wed, 2014-08-13 at 11:48 +0200, Paul Bolle wrote:
> - XB1S is apparently 0x00 at first resume (I don't know how that
>   happens);

Perhaps because this battery's _EJ0 method was evaluated previously
(say, during suspend):
DefinitionBlock ("dsdt.aml", "DSDT", 1, "LENOVO", "TP-8D   ", 0x00001390)
{
    Scope (\_SB)
    {
        Device (PCI0)
        {
            Device (LPC)
            {
                Device (EC)
                {
                    Device (BAT1)
                    {
                        Method (_EJ0, 1, NotSerialized)  // _EJx: Eject Device
                        {
                            If (Arg0)
                            {
                                [...]
                                Store (0x00, XB1S) /* \_SB_.PCI0.LPC_.EC__.BAT1.XB1S */
                            }
                        }
                    }
                }
            }
        }
    }
}

But I don't know whether that _EJ0 method is actually evaluated during
the first boot and suspend cycle.


Paul Bolle