[arch-general] cpufreq stopped working

[Leonid Isaev]

On Sat, 30 Jun 2012 21:37:39 +0100
Leonidas Spyropoulos <artafinde at gmail.com> wrote:

> On Jun 30, 2012 4:01 PM, "Leonid Isaev" <lisaev at umail.iu.edu> wrote:
> >
> > On Sat, 30 Jun 2012 10:05:29 -0400
> > Martin Zecher <mzecher at gmail.com> wrote:
> >
> > > Thanks for answering.
> > >
> > > I already installed cpupower with no luck. I think that the problem is
> > > related with the module acpi_cpufreq, which loads but does nothing at
> all.
> >
> > For basic (automatic) scaling you don't need either cpupower nor cpufreq
> nor
> > MODULES=(acpi_cpufreq) with linux 3.4.x.
> 
> Can you elaborate in that a bit more? Does the kernel handle that? What
> does the cpupower  or cpufreq offer more?

Yes, it's what they call CPU driver autoprobing:
http://kernelnewbies.org/Linux_3.4#head-9df4e508cb97f4e138c590b9ccff3e0eda6cc7fc.

Basically, if your CPU supports scaling, the corresponding driver will be
loaded automatically. This and the fact that arch kernel now defaults to
ONDEMAND governor (CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y, FS#28778),
eliminates the need for userspace tools and explicit module loading.

If you want just default scaling (within hw defaults), you don't have to do
anything beyond enabling speedstep/coolnquiet in BIOS. But if you want to see
various info, control frequency range (to downclock, for instance) or change
the governor from the userspace, you'll have to install either cpupower or
cpufrequtils. Of course, you could achive some of it functionality by simply
echoing parameters to corresponding files in /sys/devices/system/cpu/*.

If you need to control frequency based on acpi events, you'll probably need
cpupower: https://wiki.archlinux.org/index.php/CPU_Frequency_Scaling.

> 
> From your previous email, it follows
> > that your kernel oopses. Please show the complete relevant piece from
> > kernel.log (or whatever place systemd logs to, not grepped). Also, you
> could
> > try booting w/o nvidia to not taint kernel.
> >
> > >
> > >
> > > On Sat, Jun 30, 2012 at 7:58 AM, Jesse Juhani Jaara
> > > <jesse.jaara at gmail.com>wrote:
> > >
> > > > la, 2012-06-30 kello 01:14 -0400, Martin Zecher kirjoitti:
> > > > > I'm not really sure when cpufreq stopped working, maybe 2 or 3
> months
> > > > ago.
> > > > > It was working fine before and I don't really remember making any
> change
> > > > in
> > > > > configuration.
> > > >
> > > > Cpufreq utils are deprecated and replaced with cpupower utils. Try
> > > > installing cpupower and see if it works ^_^
> > > >
> > > >
> > >
> > >
> >
> >
> >
> > --
> > Leonid Isaev
> > GnuPG key: 0x164B5A6D
> > Fingerprint: C0DF 20D0 C075 C3F1 E1BE  775A A7AE F6CB 164B 5A6D

-- 
Leonid Isaev
GnuPG key: 0x164B5A6D
Fingerprint: C0DF 20D0 C075 C3F1 E1BE  775A A7AE F6CB 164B 5A6D
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