[arch-general] cpufreq stopped working

[Martin Zecher]

Thanks a lot Leonid.

When I said that the problem also happened with kernel 3.3.8, I was wrong
(because that time I forgot modprobing acpi_cpufreq). So, I just tested
different kernel versions and this started happening with 3.4.0; it works
fine until 3.3.8. And the problem is present in both vanila en -ck versions.

I think that booting from LiveCD isn't necessary since the bug seems pretty
clear, or so you think that I should also test another distribution with
linux 3.4? I don't think that there are already LiveCD's available with
such a recent kernel.


On Sun, Jul 1, 2012 at 5:50 PM, Leonid Isaev <lisaev at umail.iu.edu> wrote:

> On Sun, 1 Jul 2012 11:10:07 -0400
> Martin Zecher <mzecher at gmail.com> wrote:
>
> > Thanks a lot for your help Leonid.
> >
> > I don't know if this list allows attachments, so I better send you a
> link:
> > https://dl.dropbox.com/u/208940/journalctl
> >
>
> Please report it to https://bugzilla.kernel.org/ because this is something
> specific to your motherboard (MSI MS-1651). The relevant part starts with
> "BUG: unable to handle kernel NULL pointer dereference at (null)". But
> before,
> I would suggest booting from an arch (stable kernel 3.0.3) or another
> distro
> iso to verify that it's an issue with the latest kernel. In case of arch
> you'll have to manually modprobe acpi_cpufreq, other livecds might load it
> automatically, e.g. opensuse 12.1 (kernel 3.1.0; not sure about earlier
> versions) definitely does.
>
> >
> > On Sat, Jun 30, 2012 at 5:24 PM, Leonid Isaev <lisaev at umail.iu.edu>
> wrote:
> >
> > > 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
> > >
> >
> >
> >
>
> --
> Leonid Isaev
> GnuPG key: 0x164B5A6D
> Fingerprint: C0DF 20D0 C075 C3F1 E1BE  775A A7AE F6CB 164B 5A6D
>



-- 
Martin

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