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

Leonid Isaev
2013-01-18T01:27:21Z

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Sorry for a late reply...

On Thu, 17 Jan 2013 11:34:22 +0100
Tom Gundersen <teg@jklm.no> wrote:

> On Thu, Jan 17, 2013 at 10:46 AM, Borislav Petkov <bp@alien8.de> wrote:
> > On Wed, Jan 16, 2013 at 06:16:00PM -0600, Leonid Isaev wrote:
> >> > [ fixup Andre's address. ]
> >> >
> >> > On Wed, Jan 16, 2013 at 11:33:21PM +0100, Rafael J. Wysocki wrote:
> >> > > > down the frequancy, but is accompanied by an info-level kernel
> >> > > > message "acpi-cpufreq: overriding BIOS provided _PSD data".
> >> >
> >> > That just says that BIOS has crappy data and we're using our own.
> >>
> >> OK. Yes, my BIOS is broken, so I thought it was the reason why
> >> autoloading does not work.
> >
> > Hmm, come to think of it, we're issuing this message on SMP on *all*
> > AMDs with HW_PSTATE. Andre, remind me again why we're doing this? We're
> > basically saying that we're overriding ACPI data but we still read it
> > out from acpi_perf_data and use *that* data to prepare the frequencies
> > table. What am I missing?
> >
> >> To be more precise: "modprobe powernow-k8" returns a "no such device"
> >> error,
> >
> > That's correct - we say ENODEV on your CPU which supports hardware
> > P-states and hand off to acpi-cpufreq which has that functionality now.
> >
> >> but in kernel logs I see that acpi-cpufreq is indeed loaded:
> >> -------
> >> Jan 15 22:42:19 metal-0 kernel: [ 534.003995] acpi-cpufreq: overriding
> >> BIOS provided _PSD data
> >> Jan 15 22:42:32 metal-0 kernel: [ 547.122695] powernow-k8: this CPU is
> >> not supported anymore, using acpi-cpufreq instead.
> >> Jan 15 22:42:45 metal-0 kernel: [ 559.623068] powernow-k8: this CPU is
> >> not supported anymore, using acpi-cpufreq instead.
> >> -------
> >> (the CPU in question is phenom II x4 955). However, this is only after I
> >> attempt to _manually_ load powernow-k8 (the timestamps in [...] are ~6
> >> mins after boot is completed). So the above-mentioned handoff seems to
> >> work, but please find attached my kernel config.
> >
> > Ok, this is maybe the issue. What used to load powernow-k8 on your
> > distro before? Because basically it's enough if some script did
> > 'modprobe powernow-k8' for the handoff to just work.
> >
> > But, we also have the CPU autoprobing deal:
> >
> > http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=644e9cbbe3fc032cc92d0936057e166a994dc246
>
> Arch relies entirely on the CPU autoprobing, there are no scripts
> modprobing things at boot.

That's right, processor drivers used to be automatically loaded alongside
with kvm and kvm_amd. Now, only the KVM stuff is loaded.

>
> > so, *actually*, powernow-k8 should be loaded by default. I dunno, maybe
> > upgrade udev on your distro?
>
> Assuming Leonid's system is up-to-date, Arch ships the most recent
> udev version (197).

Yes, the system is fully updated running systemd/udev 197.

>
> Cheers,
>
> Tom

Thank you,
L.

--
Leonid Isaev
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