[ltp] Thinkpad T61, Ubuntu, cpu scaling

[Alessandro Crismani]

Hi again!

Il giorno gio, 16/06/2011 alle 11.47 +0200, Yves-Alexis Perez ha
scritto:
> On jeu., 2011-06-16 at 10:06 +0100, Alessandro Crismani wrote:
> > Hi,
> > 
> > Could you please elaborate a little more on the issue. Every time I've
> > read about battery management it was said to remove it when on AC and to
> > store it in a "cold" place (not fridge cold, but not warm either). The
> > reasoning behind this, as I was told, is beacuse the main cause of
> > battery life loss is heat, which may be high on laptops bottom surfaces.
> > Not because of constant charging (which is solved by thresholds as you
> > suggested).
> 
> Put the battery in the fridge when not in use, yes.

Well, I store it in a wardrobe, still cold enough, the fridge seems
overkill :)

> > 
> > Whom should I trust?
> 
> Henrique :)

Makes sense!

> > 
> > Please don't read this as an offensive mail, I'm not arguing with you, I
> > do not know anything about batteries. This is just to ask people (you or
> > the list) who have a better understanding of the problem.
> 
> The point is: some laptops (especially with discrete GPU and powerful
> CPUs) will eat too much power for the adaptor, especially the small
> ones. If there's no battery, then in case there's a huge power demand
> (cpu+gpu+disk+gb eth+...) the laptop will just shut down because of loss
> of power (or maybe not shut down but just do crap silently). So in some
> cases (bios detects a 65W adaptor and no battery for example), the bios
> (or the EC, I'm not sure) will limit the CPU to only the lowest
> frequencies to prevent power loss.
> 
> Note that IBM/Lenovo isn't the only one doing that, Dell does the same
> afair.


I know about the 65W and CPU scaling issue, in fact I use a 90W adapter
for this particular reason. What I do mind is my battery running out of
life just because it is heated by the laptop when I don't need it (which
is the majority of the time).

I just wanted to know if there were other reasons for keeping the
battery around besides the power consuption being too high in some
cases.

Thanks for your reply!

Cheers,
Alessandro