kern/140361: [cpufreq] speed-stepping broken on PhenomII (acpi?)
bruce at cran.org.uk
Thu Mar 25 08:01:02 UTC 2010
On Wednesday 24 March 2010 10:30:04 Hannes wrote:
> The following reply was made to PR kern/140361; it has been noted by GNATS.
> From: Hannes <freebsd at soulrebel.in-berlin.de>
> To: bug-followup at freebsd.org
> Subject: Re: kern/140361: [cpufreq] speed-stepping broken on PhenomII
> (acpi?) Date: Wed, 24 Mar 2010 10:27:34 +0000
> Is there anything I can do to help solve this issue?
> (still there on a current RELENG_8)
I don't think powerd will change the Cx level by default, but it should change
the frequency as reported by dev.cpu.X.freq where X is the CPU number. You
should be able to have the Cx levels change by setting dev.cpu.X.cx_lowest to
something other than C1, but I think you need to keep CPU 0 at C1 otherwise
the system will stop working properly (timings will change).
See http://wiki.freebsd.org/TuningPowerConsumption for more details.
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