Difference between revisions of "How to make use of Power Management features"

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(refixed link ;-))
(APM vs. ACPI: corrected)
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All ThinkPads support APM and a lot support ACPI as well, but at different qualities of implementation. The both technologies cannot be used at the simultaneously. So you'll have to make a choiche which would depend very much on the model as well as on the state of ACPI support in the kernel.
 
All ThinkPads support APM and a lot support ACPI as well, but at different qualities of implementation. The both technologies cannot be used at the simultaneously. So you'll have to make a choiche which would depend very much on the model as well as on the state of ACPI support in the kernel.
  
On older models you are surely better off with APM, if they feature ACPI at all. I.e. the first models from the A, T and X series seem to have an incomplete ACPI implementation.
+
On older models you are surely better off with APM, if they feature ACPI at all.
  
In recent models, ACPI generally works fine and is a lot more flexible than APM, but with a lot of them also a [[Problem with high power drain in ACPI sleep]] has been experienced.
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It seems that at least in all models from the A, G, R, T and X series ACPI generally works fine and is a lot more flexible than APM, but with a lot of them also a [[Problem with high power drain in ACPI sleep]] has been experienced.
  
 
>(more precise and extended info should be provided here)<
 
>(more precise and extended info should be provided here)<

Revision as of 06:05, 19 December 2004

General Information about Power Management features

This page should give you all the information you need to make use of your ThinkPads Power Management features under Linux and hence effectively enhance your battery life.

APM vs. ACPI

All ThinkPads support APM and a lot support ACPI as well, but at different qualities of implementation. The both technologies cannot be used at the simultaneously. So you'll have to make a choiche which would depend very much on the model as well as on the state of ACPI support in the kernel.

On older models you are surely better off with APM, if they feature ACPI at all.

It seems that at least in all models from the A, G, R, T and X series ACPI generally works fine and is a lot more flexible than APM, but with a lot of them also a Problem with high power drain in ACPI sleep has been experienced.

>(more precise and extended info should be provided here)<

How to enable certain features

The following links will take you to separate pages dealing with the various topics.