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Date:      Wed, 13 Jan 2010 21:42:28 +0100
From:      Guido van Rooij <guido@gvr.org>
To:        freebsd-acpi@freebsd.org
Subject:   ACPI CMBAT notify's never reach devd?
Message-ID:  <20100113204228.GA8768@gvr.gvr.org>

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I am trying to have a script shutdown a system on low battery levels and
I'm using this script:
http://www.chruetertee.ch/files/download/battery

What I see is that the script is only called when the state changes
(e.g. when the bateries start charging). 
Reading the script, it seems to imply that notify's should be sent
regularly when the level (hw.acpi.battery.life) changes.
However that does not happen.

Also, when batteries run out, the state does not change to LOW (I waited
to:
hw.acpi.battery.life: 4
hw.acpi.battery.time: 3
hw.acpi.battery.state: 1

I am not sure if this is a bug in the acpi implementation or in my laptop's
bios (the dumped DSDT indeed only seems to send SB.BAT noities in the PWRE
method). I read on http://www.columbia.edu/~ariel/acpi/acpi_howto.txt:
   If your battery doesn't support alarms, the ACPI specification requires the
   OS to poll the battery to check its remaining capacity. It appears that
   Linux  does  not  yet  do  this. In this case, it's best to run a user
   application that can check your battery status and take appropriate action.

Can anyone tell me what I need to do to use the script succesfully?
My system: Dell D820 running 8.0-release.

-Guido




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