Mobile Intel Celeron 2.0 GHz with ICH4 bridge

Mobile Intel Celeron 2.0 GHz with ICH4 bridge

[Keld Jørn Simonsen]

Hi

I have an Acer Travelmate 233 and I am trying to save some battery
power. Is that possible with cpufreq? 

The CPU is a Mobile Intel Celeron 2.0 GHz and the southbridge is an
Intel 82801DB 845G/GL Chipset ISA Bridge (ICH4)

I run Mandrake 10.0 RC1 with kernel 2.6.2 and cpufreq 1.0.1,
unfortunately I get the following message:
cpufreq: Intel(R) SpeedStep(TM) for this chipset not (yet) available.
Is this because I am running an outdated version of cpufreq,
or just because the CPU is not recognized properly?

Are there other ways to save power with this machine, on the CPU?

Best regards
Keld

Re: Mobile Intel Celeron 2.0 GHz with ICH4 bridge

[Dominik Brodowski]

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On Mon, Feb 23, 2004 at 10:36:19PM +0100, Keld Jørn Simonsen wrote:
> Hi
> 
> I have an Acer Travelmate 233 and I am trying to save some battery
> power. Is that possible with cpufreq? 
> 
> The CPU is a Mobile Intel Celeron 2.0 GHz and the southbridge is an
> Intel 82801DB 845G/GL Chipset ISA Bridge (ICH4)
> 
> I run Mandrake 10.0 RC1 with kernel 2.6.2 and cpufreq 1.0.1,
> unfortunately I get the following message:
> cpufreq: Intel(R) SpeedStep(TM) for this chipset not (yet) available.
> Is this because I am running an outdated version of cpufreq,
> or just because the CPU is not recognized properly?

The problem is that you have a Mobile Celeron which does not support
SpeedStep. All you could get from cpufreq is Clock Throttling,
(p4-clockmod), but this won't save you much in terms of battery power.

> Are there other ways to save power with this machine, on the CPU?
ACPI processor support with working C1 and C2 idle states [check
/proc/acpi/processor/*/power ]

	Dominik

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Re: Mobile Intel Celeron 2.0 GHz with ICH4 bridge

[Keld Jørn Simonsen]

On Tue, Feb 24, 2004 at 09:22:22AM +0100, Dominik Brodowski wrote:
> On Mon, Feb 23, 2004 at 10:36:19PM +0100, Keld Jørn Simonsen wrote:
> > Hi
> > 
> > I have an Acer Travelmate 233 and I am trying to save some battery
> > power. Is that possible with cpufreq? 
> > 
> > The CPU is a Mobile Intel Celeron 2.0 GHz and the southbridge is an
> > Intel 82801DB 845G/GL Chipset ISA Bridge (ICH4)
> > 
> > I run Mandrake 10.0 RC1 with kernel 2.6.2 and cpufreq 1.0.1,
> > unfortunately I get the following message:
> > cpufreq: Intel(R) SpeedStep(TM) for this chipset not (yet) available.
> > Is this because I am running an outdated version of cpufreq,
> > or just because the CPU is not recognized properly?
> 
> The problem is that you have a Mobile Celeron which does not support
> SpeedStep. All you could get from cpufreq is Clock Throttling,
> (p4-clockmod), but this won't save you much in terms of battery power.

OK, understood.

> > Are there other ways to save power with this machine, on the CPU?
> ACPI processor support with working C1 and C2 idle states [check
> /proc/acpi/processor/*/power ]

As I can see it, my system already goes in autohalt. The normal 
system power drainage is about 38 W, but I can measure the power use to
about 18 W when I do nothing, (with my harddisk in sleep, and my screen
turned to lowest intensity).

I understand that throttling is actually putting the CPU off power.
I would like to be able to shut off just the CPU, getting a savings of
about 7,5 W. Is this possible, is there a way to shut off the CPU while
having the screen and ram on power? What commands should I issue, or is
this something I need to make a program to do?

The idea is to shut off the CPU after it being idle for about a second,
and resuming the operation next time I touch the keyboard or the mouse.
1 second would allow normal typing or normal mouse movement to perform
as usual, while having the screen lit would give the impression of 
the machine being on. Going from 18 W to about 11 W would give me about
2 hours more of battery time.

best regards
keld