Power States

Power States

[Balaji Rao]

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

Re: Power States

[Alexey Starikovskiy]

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.

Re: Power States

[Balaji Rao]

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.
>


-- 
regards

Balaji Rao

Re: Power States

[Alexey Starikovskiy]

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.
>>
>
>

Re: Power States

[Balaji Rao]

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.

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

Re: Power States

[Alexey Starikovskiy]

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.
>
> 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.
>> >>
>> >
>> >
>>
>
>

Re: Power States

[Balaji Rao]

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

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.
> >
> > 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

Re: Power States

[Alexey Starikovskiy]

I already told you to look for enabling DBS/EST/speedstep in your BIOS...
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
>
> 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.
>> >
>> > 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.
>> >> >>
>> >> >
>> >> >
>> >>
>> >
>> >
>>
>
>

Re: Power States

[Oliver Henriot]

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Dans sa grande sagesse, Alexey Starikovskiy a écrit, le 20.12.2006 20:01 :
> C1 is the only C-state supported on CoreDuo2.
Could you detail why please? I've got C1 to C3 working fine on a 
Core2Duo T7200 and  2.6.19 kernel, or so it seems to me, maybe I've 
missed something?

Cheers,

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Re: Power States

[Oliver Henriot]

[-- Attachment #1: Type: text/plain, Size: 553 bytes --]

Dans sa grande sagesse, Balaji Rao a écrit, le 20.12.2006 19:51 :
> Also, power management is reported as not available.
Do you mean power management as in apm? In that case, it is most 
probably normal behavior, it seems some recent core2duo setups simply do 
not support apm at all.
> Where can i look for a solution?
I've given up apm altogether and use only cpufreq + acpi on my core2duo 
T7200 and appart from getting C3 to work even when on mains, I haven't 
had any particular hassles.

Sorry I can't give you more precise directions...

Cheers,

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Re: Power States

[Oliver Henriot]

[-- Attachment #1: Type: text/plain, Size: 888 bytes --]

Dans sa grande sagesse, Balaji Rao a écrit, le 20.12.2006 20:09 :
> 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
Indeed, that's odd. I've got yes for pm on mine...
>
> 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?
cpufreq stages from 1GHz to 2GHz via 4 steps (1.33 and 1.67 
intermediate) on my T7200, can't say for your E6300.
>
> I cant find any PSS in the DSDT dump.
Neither can I but that doesn't seem to be a problem ;-)
Can't help you more with DSDT, you probably know more about it than I 
do, I've got a lot of rtfming to do yet...

Cheers,

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Re: Power States

[Zhang Rui]

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 
> - 
> 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
> 

Re: Power States

[Lincoln Baxter, III]

I am having a similar issue with my HP nc6400 laptop 1.83ghz

I get C1, C2 on AC adapter, and I get C1, C2, C3 on Battery, but I get 
no C0 (max mhz) and no C4 or C5. (Even though they are supported and 
used under windows when I boot into that "cra**y" OS.
My APM = yes

Re: Power States

[Balaji Rao]

On 12/21/06, Oliver Henriot <Oliver.Henriot@imag.fr> wrote:
> Dans sa grande sagesse, Balaji Rao a écrit, le 20.12.2006 19:51 :
> > Also, power management is reported as not available.
> Do you mean power management as in apm? In that case, it is most
> probably normal behavior, it seems some recent core2duo setups simply do
> not support apm at all.
No i am talking about ACPI and CPUFREQ.
> > Where can i look for a solution?
> I've given up apm altogether and use only cpufreq + acpi on my core2duo
> T7200 and appart from getting C3 to work even when on mains, I haven't
> had any particular hassles.
>
I think you are talking about core 2 duo mobile processor. But mine is
a desktop one.
But the error 'ACPI Exception (acpi_processor-0680): AE_NOT_FOUND,
Processor Device
is not present [20060707]' makes me feel there is a error in the kernel.
> Sorry I can't give you more precise directions...
>
> Cheers,
>
>
>


-- 
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

Re: Power States

[Balaji Rao]

On 12/21/06, Lincoln Baxter, III <lincolnbaxter@gmail.com> wrote:
> I am having a similar issue with my HP nc6400 laptop 1.83ghz
>
Bu what i have is a desktop processor. Not sure what power states are supported.

> I get C1, C2 on AC adapter, and I get C1, C2, C3 on Battery, but I get
> no C0 (max mhz) and no C4 or C5. (Even though they are supported and
> used under windows when I boot into that "cra**y" OS.
> My APM = yes
>


-- 
warm regards

Balaji Rao

Re: Power States

[Balaji Rao]

But i have already done them. My motherboard supports only ACPI 2.0a
spec. Does it cause a problem in any way?

On 12/21/06, Alexey Starikovskiy <alexey.y.starikovskiy@linux.intel.com> wrote:
> I already told you to look for enabling DBS/EST/speedstep in your BIOS...
> 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
> >
> > 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.
> >> >
> >> > 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