XO 1.5 frequency scaling

Tiago Marques tiagomnm at gmail.com
Tue May 4 19:01:00 EDT 2010

Hi Martin,

On Tue, May 4, 2010 at 3:09 PM, Martin Langhoff
<martin.langhoff at gmail.com>wrote:

> On Mon, May 3, 2010 at 7:41 PM, Tiago Marques <tiagomnm at gmail.com> wrote:
> > I have been wondering for some time how are you controlling the frequency
> of
> > the C7 processor in Fedora. Is this being done in the background by
> LWN recently did a nice post on "idle". That should give you good
> background info.

Let me see if I understand what you said. I understand how it works on
desktop and regular laptops. You load the module for the specific power
saving feature and either a kernel module to do the job or the userspace
module which then allows a daemon to do the frequency scaling.
Now the XO 1.5, AFAIK, isn't doing it or powerd is doing it(or openfw). I
tried loading the C7 power saver module but it can't find the device. Is it
already being taken and should I not worry with frequency scaling although
/proc/cpuinfo always shows 1000MHz?

> AIUI, the job is mainly in the kernel and CPU. Outside of that, powerd
> controls aggressive suspend which is actually suspend that happens so
> fast (or should happen so fast) that the user doesn't notice -- just
> like your mobile phone does.

That's definitely working as advertised and with a top notch response time
Great work!

Best regards,

> cheers,
> m
> --
>  martin.langhoff at gmail.com
>  martin at laptop.org -- School Server Architect
>  - ask interesting questions
>  - don't get distracted with shiny stuff  - working code first
>  - http://wiki.laptop.org/go/User:Martinlanghoff
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