Re: Core2Duo locked at 800MHz

[Thomas Renninger <trenn@suse.de>]

On Tue, 2007-11-27 at 06:10 +0000, Michael Reinelt wrote:
> Hi Dave,
> 
> thanks for your answer!
> 
>  >  > When I boot the notebook into single-user mode
> >  > (using vanilla 2.6.23 or 2.6.24-rc3), with no modules loaded, the cpu 
> >  > runs at 2.4GHz. As soon as I laod the acpi-cpufreq module, the upper 
> >  > limit falls in some steps (2 GHz, 1200MHz) to 800 MHz. Note that there 
> >  > is neither acpid nor any powersave daemon running!
> > 
> > Do you have CONFIG_CPU_FREQ_GOV_ONDEMAND enabled in your kernel ?
> 
> Yes, but as a module.
> 
> >  > At the moment my workaround is *not* to load acpi-cpufreq, so the CPU 
> >  > stays at 2.4GHz all the time, but I really want to use powersaving with 
> >  > the machine....
> > 
> > I'm confused.  It sounds like you _are_ using power saving.
> > The whole purpose of cpufreq is to lower the cpu speed when idle.
> I _want_ to use powersaving, but I can't, because I'd be stuck at 800 MHz.
> 
> > If you run some cpu intensive load like a big compile, does the
> > speed go back up ?
> No, it does not.
> 
> > the cpufreq.debug=7 logs would be a good start.

It is probably limited through _PPC again.
Dave, Len: Can you please add the patch that _PPC changes are printed
with cpufreq.debug, pls.
I posted this a while ago on the cpufreq list:
Subject: [PATCH] Print _PPC changes via cpufreq debug layer
http://article.gmane.org/gmane.linux.kernel.cpufreq/5642

Thanks,

   Thomas