Re: problem with cpu eating too much power, prize given if solved

Pavel Machek
2004-06-29T22:10:19Z

Hi!

> > > Many times I just want to read the screen, eg emails or documents,
> > > and then still the cpu will be in idle mode, where
> > > it uses 7.5 W out of the about 15 W that the whole machine uses.
> > > I have found out from Intel data sheets that my
> > > Mobile Intel Celeron 2.0 GHz CPU consumes 7.5 W in idle loop/
> > > stop grant/sleep states, (and 5.0 W i deep sleep state).
> > >
> > > So I would like to have the CPU stopped completely (consuming 0 W)
> > > while I still could read the screen. In that way I should
> > > be able to have about double the lifetime on the battery,
> > > going to about 7 hours from the 3.5 hours I have now.
> > >
> > > I would like the machine to wake up again by any keystroke
> > > on the keyboard or mouse input. I would like the input to be
> > > reacted upon (not just used to wake up the system, and
> > > then forgotten).
> > >
> >
> > S1 is what you want... but... if you get what you asked for,
> > do you realize that for example clock would not update on the desktop
> > in this mode?
>
> Maybe S1 is what could do this. I understand that I could not then have
> the clock updated every second but every minute would work, and even if
> the screen was not updated every minute it would be fine. But I would
> expect the clock to be accurate when the cpu is started again.

Can you verify that your hardware can do S1? (cat /proc/acpi/sleep).

Pavel
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