[ltp] Re: ThinkPad Batteries

[Micha]

On Thu, 13 Nov 2008 17:10:37 -0200
Henrique de Moraes Holschuh <hmh@hmh.eng.br> wrote:

> On Thu, 13 Nov 2008, Elias Oltmanns wrote:
> > >> This will probably not work as expected. The settings configured through
> > >> tp_smapi are persistent if either the machine is not switched off (s2ram
> > >> is ok) or AC is plugged in. As soon as you shut the machine down and
> > >> unplug it from AC, the factory defaults will be reset and the battery
> > >> will be recharged the next time you plug in AC again.
> > >
> > > That is not true. The settings are stored on the battery afaik since
> > > turning off doesn't cause any problem. Not sure though about taking the
> > > battery out when the machine is off, need to check that one.
> 
> Nothing is stored in the battery.
> 

Makes sense but still, those thresholds hold even if I charge the computer when
it's off. I can turn it off, charge it while it's off and it still doesn't go
above the set 80%.

> > Well, it is true for my machine (X40). I wasn't aware that there are
> > differences in this respect from one model to another. But then, it
> > doesn't necessarily suprise me.
> 
> Correct.  Since somewhere in the middle of the *60 line, Lenovo stopped
> rebooting the EC or changed something in the way they did it.  Unless you
> remove ALL power from the ThinkPad, EC parameters are kept across reboots
> and shutdowns...
> 
> So, if you REALLY need to reboot the EC to a clean state in a Lenovo
> thinkpad, you may find yourself forced to remove AC, remove all battery
> packs, and maybe even do the "press the power button for 3s, at least 10
> times, then press it for 12s one last time" dance.
>