[colug-432] How can I tell what driver cpu scaling uses?

[Joshua Kramer]

You know, Rob, I was mistaken.  elrepo offers two kernels: an lt kernel
(version 3.10) and an ml kernel (version 3.12).  I tried both of these
kernels and have the same issue.  The older kernels are 2.6.32, which is
what RedHat 6 & friends ship with.

The laptop is an HP Pavilion dm4, with a dual-core i3.  I'm guessing it's
3-4 years old; I got it as a refurb unit from Micro Center a couple years
ago.


On Tue, Jan 14, 2014 at 12:50 PM, Rob Funk <rfunk at funknet.net> wrote:

> Joshua Kramer wrote:
> > I have an HP laptop that I just re-installed CentOS 6 on.  Using the
> stock
> > 2.6 kernel, 95% of the hardware works.  However, if I use a 3.1 kernel,
> 99%
> > of the hardware works.  Almost.
> >
> > With the 3.1 kernel, I cannot start cpuspeed.  It cannot write to the
> file
> >
> > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
> >
> > With the 2.6 kernel, cpuspeed runs just fine.
> >
> > I'm guessing that the 3.1 kernel provided by elrepo doesn't have the
> right
> > cpu speed scaling drivers compiled in.  Does anyone know how I can tell
> > which driver the 2.6 kernel uses for this, so I can build it for the 3.1
> > kernel?
>
> You might want to go newer than 3.1, since that dates back to Oct
> 2011. They're up to 3.12 now.
>
> I did a google search for cpufreq on kernelnewbies.org, and found that
> kernel 3.7 added a generic cpufreq driver and kernel 3.9 added a
> cpufreq driver for last year's cpus.
>
> It might also help to specify the specific 2.6 version (the earliest
> ones are ten years old) and the HP laptop model or vintage.
>
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