sony-vaio-z-series team mailing list archive

[Simon Brown <lists@xxxxxxxx>]

Hi Nicklas

I was just trying to pass on the info better expressed by Matthew
Garret here http://www.codon.org.uk/~mjg59/power/good_practices.html

I've no idea what windows does, but there's no guarantee that it does
anything optimal :-)

Simon

At Mon, 14 Nov 2011 13:33:06 +0200,
Nicklas Overgaard wrote:
> Interesting point :)
> 
> I actually though windows did the same when you set it "power save mode" 
> - but maybe i'm wrong.
> 
> So maybe I should limit it in way that it does not throttle all the way 
> up to 2.8 Ghz but just, let's say, 1.7 or whatever the intermediate 
> steps are?
> 
> /Nicklas
> 
> On 2011-11-07 21:53, Simon Brown wrote:
> > At Mon, 07 Nov 2011 21:09:00 +0200,
> > Nicklas Overgaard wrote:
> >> [1<multipart/alternative (7bit)>]
> >> [1.1<text/plain; UTF-8 (7bit)>]
> >> Hey Nicolas,
> >>
> >> I bought the 7 hours of battery life for windows by:
> >>
> >> 1. Setting the power plan to "power saver"
> >> 2. Dimming the panel to almost the lowest level
> >>
> >> On linux:
> >>
> >> 1. Running kernel 3.1
> >> 2. Patching it with the "vaio full 3.0" patch - i believe it's part of
> >> the sony laptop module as well
> >> 3. Installing laptop mode tools and assuring that my CPU never goes
> >> higher than 800 mhz when on battery
> > Throttling the CPU is a bad idea. You want the CPU to be idle for as
> > long as possible so it can enter sleep states, disable cores and the
> > like. Throttling the clock rate just makes work take longer and should
> > cost you battery life for the same workload.
> >
> > Simon
> 
> 
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