[Thinkpad] A21P battery not seen

[Bruce Markowitz]

No mystery at all. You need to downgrade the BIOS (and the embedded
controller if that can be done on this model).
----- Original Message ----- 
From: <ted.frater at virgin.net>
To: <thinkpad at stderr.org>
Sent: Monday, April 09, 2007 3:52 PM
Subject: [Thinkpad] A21P battery not seen


> Hi All,
>
> Weve 2 identical A21P's  in our household, amongst other thinkpads. ( im
> a dealer in a very small way)
> one (thats mine) with its original bios  running dual boot win
> 98/Slackware 10.2
> My after market battery is seen both by windows and by linux.
> the other  ( thats my sons's) has the latest bios, running ubuntu  and
> works fine with a genuine ibm battery tho this has only 10 minsof life
> in it after a full charge. BUT it wont see my after market battery at
> all. It thinks its running on mains when in fact itsrunning on the
> battery, which has been fully charged in my A21P.
>  So how can the latest bios, which is the only difference in the 2
> machines effect the battery in this way?
> As of now its a complete mystery.
>  any help much appreciated.
>  Now one option would be to revert the bios to the original. Can this be
> done? and if so how? would it be safe to do so?
>
>  Ted Frater Dorset UK.
>
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