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

[Robin Holt <holt@sgi.com>]

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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