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

Robin Holt
2008-05-23T09:40:39Z

Definitely the battery. I just rebooted to XP and did a similar
experiment with their battery monitor and it behaved equivalently
(although they present only percentages). So, I would say this is
something unrelated and was just finally noticed because I was paying
more attention.

Thanks,
Robin

On Fri, May 23, 2008 at 03:43:46AM -0500, Robin Holt wrote:
> I think this is my battery/laptop ACPI. I just booted back to 2.6.22-14
> and the behavior remained the same. Interestingly, it started chaged
> to 4096mAh and I unplugged it. The battery began discharging. When it
> reached 3800mAh, I plugged it back in. The battery indicated it was
> charging, but remaining capacity slowly declined to 3072mAh where it
> stablized. Removing/Instaling the battery gave no change in behavior,
> upon reinsertion, the reading remained at 3072mAh. I then unplugged the
> charger. It was approx 35 seconds before the reading began to trickle
> back down. Again, it trickled down slowly (which it is doing currently).
>
> Either it has always behaved this way and I just didn't notice it or
> something has changed inside my battery. I have not done any BIOS update
> in years (last one that was available).
>
> Thanks,
> Robin
>
> On Fri, May 23, 2008 at 09:21:56AM +0200, Pavel Machek wrote:
> > 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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