sony-vaio-z-series team mailing list archive

[Nicklas Overgaard <nicklas@xxxxxxxxx>]

Hi Simon,

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