linux-kernel - Re: Sony laptop battery has odd behavior with 2.6.26-rc3ish build.

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Date:	Fri, 23 May 2008 09:21:56 +0200
From:	Pavel Machek <pavel@....cz>
To:	Robin Holt <holt@....com>
Cc:	astarikovskiy@...e.de, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: Sony laptop battery has odd behavior with 2.6.26-rc3ish build.

Hi!

> A couple days ago, I updated my test build to commit
> 8033c6e9736c29cce5f0d0abbca9a44dffb20c39 and noticed an odd behavior
> with the battery.  If I unplug the power, the battery discharges and
> that is reflected in /proc/acpi/battery/BAT0/state.  I am not certain
> the discharge is continuous and uniform or if it goes in steps.  When I
> plug the power back in, the level stays at a constant value (+-1mAh)
> for a considerable period of time.  It then does a single step back to
> the fully charged value.
> 
> I have not done any searching to see when this began.  I had been running
> the ubuntu 2.6.22-14 kernel before this and the behavior was normal.
> 
> I am not certain what information you will need.  Commit is above.

git bisect would certainly help...

> $ cat /proc/acpi/battery/BAT0/alarm
> alarm:                   unsupported
> $ cat /proc/acpi/battery/BAT0/info
> present:                 yes
> design capacity:         4800 mAh
> last full capacity:      4096 mAh
> battery technology:      non-rechargeable

Because something is clearly wrong here.

						Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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