Re: Power States

[Zhang Rui <rui.zhang@intel.com>]

On Thu, 2006-12-21 at 03:20 +0800, Balaji Rao wrote:
> also i get these two errors. kernel version 2.6.20-rc1-mm1 
> ACPI Exception (acpi_processor-0680): AE_NOT_FOUND, Processor Device 
> is not present [20060707] 
> ACPI Exception (acpi_processor-0680): AE_NOT_FOUND, Processor Device 
> is not present [20060707] 
> and,
> 
> acpi_processor-0740 [00] processor_preregister_: Error while parsing 
> _PSD domain information. Assuming no coordination
> 
This is just a warning.
> does power management "no" mean, hardware does not suppport it? or
> can 
> it be enabled?
> 
> On 12/21/06, Alexey Starikovskiy
> <alexey.y.starikovskiy@linux.intel.com> wrote: 
> > 6 is lowest FSB multiplier, 0.266*6 = 1.6GHz -- your lowest. 
> > 7 is multiplier to get 1.86Ghz -- your max. 
> > 
> > "power management:        no"  means  power management is disabled. 
> > 
> > 
> > Balaji Rao wrote: 
> > > also, the file cat /proc/acpi/processor/CPU1/info gives this 
> > > 
> > > processor id:            0 
> > > acpi id:                 1 
> > > bus mastering control:   yes 
> > > power management:        no 
> > > throttling control:      yes 
> > > limit interface:         yes 
> > > 
> > > Is power management not available according to this file? 
> > > 
> > > One more thing is that, only two frequency levels ( 1.86 and 1.6
> Ghz) 
> > > are being used. This does not cause much power saving.. 
> > > 
> > > How many levels are actually available on core 2 duo? 
> > > 
> > > I cant find any PSS in the DSDT dump. 
_PSS may be contained in DSDT, SSDT and dynamic loaded tables.
If you have any doubts, open a bug report in bugzilla.kernel.org
attach your kernel config, acpidump and dmesg at the same time.
> > > 
> > > On 12/21/06, Alexey Starikovskiy 
> > > <alexey.y.starikovskiy@linux.intel.com> wrote: 
> > >> Then you should check your BIOS settings for DBS/EST/speedstep
> etc 
> > >> support. 
> > >> C1 is the only C-state supported on CoreDuo2. 
> > >> PSS should give you P-states. 
> > >> 
> > >> Balaji Rao wrote: 
> > >> > But, acpidump doest give me anything saying SSDT.. 
> > >> > Actually the problem is, only one power state(C1) is being
> shown up in 
> > >> > my Core 2 Duo (E6300) box. 
> > >> > 
> > >> > Also, power management is reported as not available. 
> > >> > 
> > >> > Where can i look for a solution? 
> > >> > 
> > >> > 
> > >> > On 12/21/06, Alexey Starikovskiy 
> > >> > <alexey.y.starikovskiy@linux.intel.com> wrote: 
> > >> >> Balaji Rao wrote: 
> > >> >> > Hello all, 
> > >> >> > 
> > >> >> > Are the various power levels supported by the processor
> provided 
> > >> only 
> > >> >> > through the DSDT? Or is there any other table for this
> purpose? 
> > >> >> > When i disassembled my DSDT, i could not find any _PSS
> Packages. 
> > >> >> > 
> > >> >> > From where does the kernel read values into the frequency
> table? 
> > >> >> > 
> > >> >> > Also, which is the mechanism that decides to load the
> appropriate 
> > >> >> > cpufreq driver? 
> > >> >> > 
> > >> >> > warm regards 
> > >> >> > 
> > >> >> > Balaji Rao 
> > >> >> > - 
> > >> >> > To unsubscribe from this list: send the line "unsubscribe 
> > >> >> linux-acpi" in 
> > >> >> > the body of a message to majordomo@vger.kernel.org 
> > >> >> > More majordomo info at  http://vger.kernel.org/majordomo-
> info.html 
> > >> >> Check SSDTs as well. 
> > >> >> 
> > >> >> Regards, 
> > >> >>     Alex. 
> > >> >> 
> > >> > 
> > >> > 
> > >> 
> > > 
> > > 
> >
> 
> 
> --  
> warm regards
> 
> Balaji Rao 
> - 
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