Date: Fri, 13 Jan 2006 23:41:52 -0500
From: Dave Jones <davej@redhat.com>
To: Philipp Rumpf <prumpf@gmail.com>
Cc: Con Kolivas <kernel@kolivas.org>, ck list <ck@vds.kolivas.org>,
       linux kernel mailing list <linux-kernel@vger.kernel.org>
Subject: Re: 2.6.15-ck1
Message-ID: <20060114044152.GA3127@redhat.com>
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On Fri, Jan 13, 2006 at 09:42:26PM -0600, Philipp Rumpf wrote:
 > Out of curiosity, why didn't you do the monitoring using
 > /proc/acpi/battery/.../{state,info} (while running off battery)?  I
 > think that should have much finer granularity, and avoid various
 > capacitors that might be in the way and explain the effect you
 > noticed.

ACPI battery reporting seems hit-or-miss at times.
Sometimes it seems to not update for ages, and then suddenly
there's a burst when suddenly 5% of the battery drains in
seconds.   As an overall 'how much battery is left' thing it seems
ok, but I don't trust it for accurate measurements of power drain.

Whether this is a firmware deficiency causing us not to see
regular interrupts, or a problem with the acpi parser I don't know.

		Dave

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