RE: can't switch CPU frequency while running on batterypower

RE: can't switch CPU frequency while running on batterypower

[Yu, Luming]

> CONFIG_X86_ACPI_CPUFREQ=y
> CONFIG_X86_ACPI_CPUFREQ_PROC_INTF=y

Please try patch filed at
http://bugzilla.kernel.org/show_bug.cgi?id=1489

--Luming


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RE: can't switch CPU frequency while running on batterypower

[Defiant]

>> CONFIG_X86_ACPI_CPUFREQ=y
>> CONFIG_X86_ACPI_CPUFREQ_PROC_INTF=y
>
> Please try patch filed at
> http://bugzilla.kernel.org/show_bug.cgi?id=1489

Tried the patch, but it didn't solved the Problem.

Well at least I found out some more Info about.
My full speed is 1600, low speed is 1200Mhz:

When running on AC Adapter, I can switch the speed as often as I want.
So If I set it to 1200 and then disconnect the AC, I can also switch
between both speeds under battery power. Now If it is 1200 and I connect
the AC I can not set it back to 1600.
Well like I said in my preceding post it is the same: Running with AC,
speed set to 1600, disconnecting the AC, I can not set the speed down to
1200.

Hope that this wasn't that complicated (in my bad English),
Erik Andresen

--

All I ask is a tall ship, and a star to steer her by
> defiant.homedns.org <
 -cause Experience is Knowledge



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RE: can't switch CPU frequency while running on batterypower

[Nate Lawson]

On Tue, 6 Jan 2004, Defiant wrote:
> >> CONFIG_X86_ACPI_CPUFREQ=y
> >> CONFIG_X86_ACPI_CPUFREQ_PROC_INTF=y
> >
> > Please try patch filed at
> > http://bugzilla.kernel.org/show_bug.cgi?id=1489
>
> Tried the patch, but it didn't solved the Problem.
>
> Well at least I found out some more Info about.
> My full speed is 1600, low speed is 1200Mhz:
>
> When running on AC Adapter, I can switch the speed as often as I want.
> So If I set it to 1200 and then disconnect the AC, I can also switch
> between both speeds under battery power. Now If it is 1200 and I connect
> the AC I can not set it back to 1600.
> Well like I said in my preceding post it is the same: Running with AC,
> speed set to 1600, disconnecting the AC, I can not set the speed down to
> 1200.

This is most likely a problem with re-evaluation of _PSS after it has been
changed.  I don't remember if Linux uses the notify on the processor
object to re-evaluate _PSS.  If Linux does this correctly, it may be that
the underlying firmware has a bug and you should use a more specific
cpufreq driver (i.e. SpeedStep or whatever).  Some systems have a problem
where they don't properly export firmware information to the ACPI
performance states interface.

-Nate


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RE: can't switch CPU frequency while running on batterypower

[Defiant]

> This is most likely a problem with re-evaluation of _PSS after it has been
> changed.  I don't remember if Linux uses the notify on the processor
> object to re-evaluate _PSS.  If Linux does this correctly, it may be that
> the underlying firmware has a bug and you should use a more specific
> cpufreq driver (i.e. SpeedStep or whatever).  Some systems have a problem
> where they don't properly export firmware information to the ACPI
> performance states interface.
>
> -Nate
>

uhm, I don't know why, but it is working now, using
CONFIG_X86_P4_CLOCKMOD instead of CONFIG_X86_SPEEDSTEP_ICH, even it is a
Pentium 4m, not Pentium 4.

I hope that someone with the same Problem will read this.

thanks for your help,

Erik Andresen

--

All I ask is a tall ship, and a star to steer her by
> defiant.homedns.org <
 -cause Experience is Knowledge



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RE: can't switch CPU frequency while running on batterypower

[Nate Lawson]

On Tue, 6 Jan 2004, Defiant wrote:
> Nate Lawson wrote:
> > This is most likely a problem with re-evaluation of _PSS after it has been
> > changed.  I don't remember if Linux uses the notify on the processor
> > object to re-evaluate _PSS.  If Linux does this correctly, it may be that
> > the underlying firmware has a bug and you should use a more specific
> > cpufreq driver (i.e. SpeedStep or whatever).  Some systems have a problem
> > where they don't properly export firmware information to the ACPI
> > performance states interface.
>
> uhm, I don't know why, but it is working now, using
> CONFIG_X86_P4_CLOCKMOD instead of CONFIG_X86_SPEEDSTEP_ICH, even it is a
> Pentium 4m, not Pentium 4.

Sure.  In general, it's better to use a hw-specific cpufreq driver instead
of the generic ACPI one, even if the latter seems to work.  Many chipsets
don't export the hw-specific information to ACPI correctly and thus ACPI
performance states cpufreq should be a last resort.  If they still don't
work, you should try multiple hw-specific drivers, as you did.

-Nate


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Re: can't switch CPU frequency while running on batterypower

[Ducrot Bruno]

On Tue, Jan 06, 2004 at 01:39:44PM -0800, Nate Lawson wrote:
> On Tue, 6 Jan 2004, Defiant wrote:
> > Nate Lawson wrote:
> > > This is most likely a problem with re-evaluation of _PSS after it has been
> > > changed.  I don't remember if Linux uses the notify on the processor
> > > object to re-evaluate _PSS.  If Linux does this correctly, it may be that
> > > the underlying firmware has a bug and you should use a more specific
> > > cpufreq driver (i.e. SpeedStep or whatever).  Some systems have a problem
> > > where they don't properly export firmware information to the ACPI
> > > performance states interface.
> >
> > uhm, I don't know why, but it is working now, using
> > CONFIG_X86_P4_CLOCKMOD instead of CONFIG_X86_SPEEDSTEP_ICH, even it is a
> > Pentium 4m, not Pentium 4.
> 
> Sure.  In general, it's better to use a hw-specific cpufreq driver instead
> of the generic ACPI one, even if the latter seems to work.  Many chipsets
> don't export the hw-specific information to ACPI correctly and thus ACPI
> performance states cpufreq should be a last resort.  If they still don't
> work, you should try multiple hw-specific drivers, as you did.
> 

What is strange though is that speedstep-ich is a non-acpi driver.

-- 
Ducrot Bruno

--  Which is worse:  ignorance or apathy?
--  Don't know.  Don't care.


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RE: can't switch CPU frequency while running on batterypower

[Li, Shaohua]

When switching between AC and battery, _PPC method may return a different P-state limit. Please verify if 'cat /proc/acpi/processor/CPU0/limit' is different under the two situations.

Thanks,
Shaohua


> -----Original Message-----
> From: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org [mailto:acpi-devel-
> admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org] On Behalf Of Defiant
> Sent: 2004年1月7日 2:08
> To: acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
> Subject: RE: [ACPI] can't switch CPU frequency while running on
> batterypower
> 
> >> CONFIG_X86_ACPI_CPUFREQ=y
> >> CONFIG_X86_ACPI_CPUFREQ_PROC_INTF=y
> >
> > Please try patch filed at
> > http://bugzilla.kernel.org/show_bug.cgi?id=1489
> 
> Tried the patch, but it didn't solved the Problem.
> 
> Well at least I found out some more Info about.
> My full speed is 1600, low speed is 1200Mhz:
> 
> When running on AC Adapter, I can switch the speed as often as I want.
> So If I set it to 1200 and then disconnect the AC, I can also switch
> between both speeds under battery power. Now If it is 1200 and I connect
> the AC I can not set it back to 1600.
> Well like I said in my preceding post it is the same: Running with AC,
> speed set to 1600, disconnecting the AC, I can not set the speed down to
> 1200.
> 
> Hope that this wasn't that complicated (in my bad English),
> Erik Andresen
> 
> --
> 
> All I ask is a tall ship, and a star to steer her by
> > defiant.homedns.org <
>  -cause Experience is Knowledge
> 
> 
> 
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RE: can't switch CPU frequency while running on batterypower

[Defiant]

> When switching between AC and battery, _PPC method may return a different
> P-state limit. Please verify if 'cat /proc/acpi/processor/CPU0/limit' is
> different under the two situations.
>
> Thanks,
> Shaohua

No, it is not different.
I get both times

active limit:            P0:T0
platform limit:          P0:T0
user limit:              P0:T0
thermal limit:           P0:T0

I guess, this is not good?

Erik Andresen


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RE: can't switch CPU frequency while running on batterypower

[Yu, Luming]

> 
> 
> > When switching between AC and battery, _PPC method may 
> return a different
> > P-state limit. Please verify if 'cat 
> /proc/acpi/processor/CPU0/limit' is
> > different under the two situations.
> >
> > Thanks,
> > Shaohua
> 
> No, it is not different.
> I get both times
> 
> active limit:            P0:T0
> platform limit:          P0:T0
> user limit:              P0:T0
> thermal limit:           P0:T0
> 
> I guess, this is not good?

Did you find any warning or error message in boot log?
Maybe there are some potential ACPI bug.



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