Re: SSDT on Sony VAIO

[Dominik Brodowski <linux-JhLEnvuH02M@public.gmane.org>]

On Wed, Jan 15, 2003 at 05:08:40PM -0800, Grover, Andrew wrote:
> > From: Nathan Conrad [mailto:conrad-aYgNHrD+FxfR7s880joybQ@public.gmane.org] 
> > I am using kernel 2.5.55 on a Sony Vaio PCG-FXA49. Right now,
> > /proc/acpi/processor/CPU0/info says that performance management is
> > not available. My CPU (1.2 GHz mobile Athlon4) supports PowerNow, and
> > I would expect this would qualify as performance management.
> > 
> > I have looked at my ACPI tables and there is a listing of 5 P-states
> > in my SSDT (1200 MHz,1000,800,600,500 MHz).
> > 
> > Why are these not listed in my /proc/acpi/processor/CPU0 directory?
> > 
> > Does the current Linux ACPI driver look at the SSDT tables, or does it
> > only look at the DSDT for AML?
> 
> It should consume both SSDT and DSDT tables.
> 
> You might try taking a look at the "performance management" section of
> drivers/acpi/processor.c. Stick some printk's in
> acpi_processor_get_performance_states and see where things are going
> awry.
> 
> Also, if _PCT isn't present in the namespace as well, then it flags perf
> support as not available.

Also, do you have CONFIG_CPU_FREQ and CONFIG_ACPI_PROCESSOR_PERF enabled? If
not, support for "performance management" will be disabled.

	Dominik


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