From mboxrd@z Thu Jan  1 00:00:00 1970
From: Matthew Garrett <mjg59@srcf.ucam.org>
Subject: Re: /sys/class/power_supply/BAT0/ charge_ vs energy_
Date: Mon, 9 Jan 2012 13:37:22 +0000
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To: Jamie Kitson <jamie@kitten-x.com>
Cc: linux-acpi <linux-acpi@vger.kernel.org>

On Mon, Jan 09, 2012 at 12:10:00PM +0000, Jamie Kitson wrote:

> If I boot with AC plugged in the /sys/class/power_supply/BAT0/
> directory is populated with charge_*, but if I boot on battery the
> directory is populated with energy_*.
> 
> Disconnecting/connecting the power after boot does not effect the file names.
> 
> Is this a bug or a feature? It makes scripts harder to write than necessary.

It's the way Lenovo's firmware works. It's not clear why.

-- 
Matthew Garrett | mjg59@srcf.ucam.org