[ltp] 600E battery under apmd

[Martin West]

I have a similar problem on iSeries 1200 with RH7.1. It will occassionally
suddenly decide the battery is flat, even though its plugged into the mains,
and do a hibernation prompt. At this point I have to reboot becuase it
dropped power on my pcmcia lan card. The battery works fine in Windows/ME so
I would assume it is a kernel/apm software problem.
regards Martin West

----- Original Message -----
From: "Dale Chayes" <dale@ldeo.columbia.edu>
To: <linux-thinkpad@www.bm-soft.com>
Sent: Tuesday, January 08, 2002 2:34 PM
Subject: Re: [ltp] 600E battery under apmd


> On Tue, 2002-01-08 at 08:44, Derek Harding wrote:
> > Running SuSE 7.3 - kernel 2.4.10 - KDE 2.
> > I wonder if any of you folk can tell me why my battery seems to go from
86%
> > to 5% in a matter of seconds yet the battery is actually fine and
recharging
> > is too quick for it to actually be low. If I use the add-on battery in
the cd
> > slot it goes on for ever. Is it a solution to disable the apmd and run
on
> > trust and watch-keeping?
> > ....
>
> Hmmm,
>
> I found a similar problem (RH 7.2 - updated to kernel 2.4.7-13 on my X20
> using gnome if that matters.)  I also had serious instability problems
> with suspend/resume.
>
> I made a new kernel with one change in the apmd section of `make
> menuconfig`  I changed "allow interrupts during APM BIOS calls" from NO
> to YES
>
> and life got signficantly better.
>
> I was impressed to note that in the "HELP" section there is a
> fascinating clue from those who know more about this than I:
>
> ======begin quote =====
> CONFIG_APM_ALLOW_INTS:
> Normally we disable external interrupts while we are making calls to
> the APM BIOS as a measure to lessen the effects of a badly behaving
> BIOS implementation.  The BIOS should reenable interrupts if it
> needs to.  Unfortunately, some BIOSes do not -- especially those in
> many of the newer IBM Thinkpads.  If you experience hangs when you
> suspend, try setting this to Y.  Otherwise, say N.
> ========= end quote ========
>
> I suspect that this may be BIOS-version dependent among other things.
>
> -Dale
>
> --
> Dale Chayes <dale@ldeo.columbia.edu>
> Lamont-Doherty Earth Observatory of Columbia University
> V: 845-365-8434     F: 845-359-6940
>
>
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