Re: cpu won't stay in powersave mode

[Dominik Brodowski <linux@dominikbrodowski.de>]

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On Mon, Dec 15, 2003 at 03:18:04PM +0000, Tom Bruno wrote:
> Sorry, accendtly hit reply instead of send to list.
> 
> On Mon, 2003-12-15 at 14:14, Thomas Renninger wrote:
> > Tom Bruno wrote:
> > 
> > >Like i said above if I change it via hand using echo, /proc/cpuinfo
> is
> > >correct, and the cputest reports the correct speed constantly.
> > >
> > >performance mode: 2.4ghz
> > >powersave mode: 1.2ghz
> > >Intel P4-M 2.4ghz
> > >Dell Inspiron 8500 - Bios A05
> > >kernel-2.6.0-test11
> > >  
> > >
> > /proc/cpu_info didn't work for me, too.
> > However it seems to work now(after I changed the governors to be 
> > compiled as modules(or the way around?)).
> > 
> I've now tried both as modules, and compiled in, /proc/cpuinfo works
> niether report correctly.
> 
> > If you want to detemine the current real speed of your machine use the
> > procspeed prog I posted some days ago(04.12, 09.12).
> 
> yes, that is the program i spoke of.  However, like i said, when
> /proc/cpuinfo is reporting wrong, my system works it's way back to full
> speed even though powersave is in the /sys scaling_governor.
> 
> It will report the changed speed (clockdown to 1.2ghz) for about 10
> seconds, and then will start to report again at 2.4ghz even though the
> setting haddn't changed.

I think the BIOS is meddling with the speedstep setting [this is more
common for older systems, but obviously some vendors still think it's a good
idea] . If it were cpufreq, the value in /proc/cpuinfo would be updated as
well.

Do you run an ACPI-enabled kernel? 

	Dominik

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