Re: [arch-general] powernow-k8 fails to load with linux 3.7.2

Rafael J. Wysocki
2013-01-16T22:33:21Z

On Wednesday, January 16, 2013 09:37:58 PM Tom Gundersen wrote:
> [dropped arch-general, added kernel folks]
>
> On Wed, Jan 16, 2013 at 8:17 PM, Leonid Isaev <lisaev@umail.iu.edu> wrote:
> > On Wed, 16 Jan 2013 11:10:19 +0100
> > Tom Gundersen <teg@jklm.no> wrote:
> >
> >> On Wed, Jan 16, 2013 at 5:47 AM, Leonid Isaev <lisaev@umail.iu.edu> wrote:
> >> > I just installed linux 3.7.2 from [testing] on an AMD system and
> >> > noticed that powernow-k8 is not loaded.
> >>
> >> Probably due to this:
> >> <http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=e1f0b8e9b04a262834ed1>.
>
> [...]
>
> >> Hm, I thought acpi_cpufreq should have been loaded instead, no idea
> >> why that does not happen for you. Could you try loading it manually?
> >
> > Neither acpi_cpufreq nor powernow_k8 is loaded automatically which of course
> > leads to failure of all custom units configuring ondemand governor via
> > sysfs. Manually modprob'ing acpi_cpufreq does work and indeed properly scales
> > down the frequancy, but is accompanied by an info-level kernel message
> > "acpi-cpufreq: overriding BIOS provided _PSD data".
> >
> > So, if the cpufreq driver works OK for other AMD users, I'll happily blame
> > asus...
>
> Matthew, Andre, Rafael,
>
> Is what Leonid experinces above expected behavior or is this a bug? He
> is using stock Arch kernel, which is almost vanilla 3.7.3 (see [0] for
> the applied patches, nothing looks relevant).

Well, I was afraid that something like this would happen after the recent AMD
cpufreq changes.

Andre, do we have a clear way to address these problems?

Rafael

--
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.