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>
next in thread | previous in thread | raw e-mail | index | archive | help
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
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20041211122430.GB714>