Re: cpufreq on TiBook II (was: Powerbook G4 getting very hot. Solution?)
On 18/07/2003 at 14:36, Teemu Ikonen wrote:
> On 18/07/03 10:02, Kiko wrote:
> > My iBook also becomes quite hot after some time of use in this season.
> > In my case, the responsible is the hard disk. I use this daemon:
> > http://mnm.uib.es/~gallir/cpudyn/
> > that sets powersave/performance modes dynamically (I do not notice any
> > performance degradation, it works quite well).
>
> This kind of software would be very useful in prolonging the battery time,
> but I noticed that it does not work in my Powerbook G4 550 Mhz (aka TiBook
> II aka Powerbook3,3) due to lack of kernel support for /proc/cpufreq.
Indeed it is!, but the main advantage for me is reducing temperature
(but it does extend battery duration, and thus battery life).
> Is this because the the hardware in this particlar model does not support
> changing the cpu frequency, lack of specs or what? I noticed that most of
> the other G4 Powerbook models are supported, including Powerbook3,2 and
> Powerbook3,4. Is there something I could do to help get this working?
Well, first thing you must know: does your cpu support frequency
scaling? Don't know if your TiBook does, I would bet it does, but really
have no idea.
Then, compile a kernel with support for it (or get a precompiled one).
IIRC, frequency scaling support is not included in vanilla kernel
sources (from www.kernel.org), _it is_ in BenH, and in "-ac" branches
(Alan Cox patches).
You can know if your kernel has support for frequency scaling compiled
in because there will exist /proc/cpufreq.
Then, cpudyn should work "out of the box" (in fact, the only thing you
have to activate if you want it, is automatic disk standby after
inactivity; it is disabled by default).
Best regards.
--
Kiko
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