ubuntu-phone team mailing list archive

[g.bach@xxxxxxxxxxx]

I have not explain correctly my thought. On android the "max" fréquency is always same, effectively the cpu's frequency is not always at the max but same with screen off she can be up to the max.
On my settings i have lock the max frequency when the screen is off to 300mhz to limit battery usage, i have good score with this settings (up to 4 days on battery, with web, ebooks etc...).
I was wondering if ubuntu handle the processor as that.
Hoping to have cleared up a bit my questions.

Regards

> Message du 24/03/13 21:38
> De : "Christopher Noel Hesse" 
> A : g.bach@xxxxxxxxxxx
> Copie à : "ubuntu-phone" 
> Objet : Re: [Ubuntu-phone] Question about : cpu's frequency
>

> Dunno if I got you wrong there, but what exactly do you mean by:
> 
> "on android the cpu frequency is always same (screen off or on)." ?
> 
> The frequency on Android is *NOT* always the same. It all depends on your
> kernel, but on high load, your cpu will most likely ramp up to the max
> allowed frequency, in your case 1200MHZ (I assume).
> When idling, the cpu will ramp down to the min frequency (300MHZ for you)
> and enter Deep Sleep if all goes well and you have no apps causing a
> wakelock.
> 
> I assume Ubuntu Touch handles this just the same way Android does, because
> most factors causing a frequency change are kernel related anyways. We just
> have no tool to display current frequencies on Ubuntu Touch as of now (at
> least no graphical ones).
> 
> 
> 2013/3/24 
> 
> > Hi all,
> > I have an question about cpu's frequency, how ubuntu touch use it ?
> > I explain my constation
> > on android the cpu frequency is always same (screen off or on).
> > I have tune my galaxy S3 cpu's frequency for 300Mhz when screen off and
> > 1200Mhz screen on.
> > With galaxy nexus on ubuntu touch the battery was use for 10% for 2 hours
> > screen off.
> > If we can tune cpu's frequency, we can render more efficient the battery
> > usage.
> > The ideal settings is when the phone use just battery when is power on
> > (minimum battery usage screen off 1-2% per hour for example, 3-4 with 3G or
> > wifi, more with bluetooth).
> >
> > Regards
> > Guillaume
> >
> > Ps : Sorry for my poor english
> >
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