Date: Sat, 11 Dec 2004 13:24:30 +0100 From: Yann Berthier <yb@sainte-barbe.org> To: freebsd-acpi@freebsd.org Subject: Re: suspend status Message-ID: <20041211122430.GB714@hsc.fr> In-Reply-To: <20041211092048.GA15338@droopy.unibe.ch> References: <20041211014613.GK695@hsc.fr> <41BA61C6.9080903@centtech.com> <20041211092048.GA15338@droopy.unibe.ch>
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On Sat, 11 Dec 2004, Tobias Roth wrote:
> On Fri, Dec 10, 2004 at 08:56:06PM -0600, Eric Anderson wrote:
> >
> > Refigure your math - if 100% cpu means 3hrs 18 minutes of runtime left,
> > then that about 200 minutes of runtime. So 1% equals 2 minutes of
> > runtime roughly. So, you suspend - and wait up 90 minutes later. If it
> > would have been running like normal, it would eat up 1% per 2 minutes,
> > so about 45% of your battery - but it didn't, it only ate up 20%. So
> > ath that rate, it was using less than half the power as when in
> > non-suspend mode.
>
> how long would the same laptop/battery survive when suspended from
> windows? i always had in mind that a suspended laptop is supposed to
> live for more than a day, which clearly is not the case in your example.
>
> you often hear comparisons here about how much less battery windows uses
> when compared to FreeBSD (or rather, how much better windows battery
> saving techniques are). detailed comparisons of bsd <-> linux <-> windows
> with good guesses of why the discrepancies are there would help.
>
> i am just trying to say that battery saving in suspend probably IS bad
> in FreeBSD (as compared to the possible optimum, as windows shows it).
> it's not just bad math in the above example.
Thanks, that was my point, though not clearly exposed i'm afraid (the
2 AM post excuse ;) I can do whatever maths you want, it leads me to
the following conclusion that my laptop can't stay unplugged more
than a few hours even suspended. It used to be an order of magnitude
better with FreeBSD and ACPI, so as a user i tend to consider this a
regression, even if it was with another laptop (toshiba)
- yann
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